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Glossary of numismatics
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Part of a series on
Numismatics
the study of currency
Currency
Circulating currencies
Local currencies
Fictional currencies
Proposed currencies
History of money
Historical currencies
Medieval currencies
Production
Collection
Coin collecting
Notaphily
Exonumia
Scripophily

This glossary of numismatics is a list of definitions of terms and concepts relevant to numismatics and coin collecting, as well as sub-fields and related disciplines, with concise explanations for the beginner or professional.

Numismatics (ancient Greek: νομισματική, meaning "monetary") is the scientific study of money and its history in all its varied forms. While numismatists are often characterized as studying coins, the discipline also includes the study of other types of money, such as banknotes, stock certificates, medals, medallions, and tokens (also referred to as exonumia).

Sub-fields and related fields of numismatics include:

A

[edit]
adjustment
The filing down of a blank to the correct mass before striking, shown by file marks. File marks are often still visible on the surface of a coin even after being struck.
alliance coinage
Coins minted by two or more state governments in cooperation. Examples include the euro coins.
alloy
A homogeneous mixture of two or more chemical elements, where the resulting compound has metallic properties. Common coin alloys include cupro-nickel (copper and nickel) and bronze (copper and tin).
altered date
A false date put on a coin to defraud collectors, usually to make it appear more valuable. Such alterations are often easily spotted with the aid of a magnifying glass.
anepigraphic coin
A coin without an epigraph or inscription. Many ancient coins used only a simple picture of an animal to show value or weight.
annealing
The process of repeatedly heating and cooling metal in order to relieve stresses. This is often done with coin blanks to make the metal less brittle before striking.
assay
A test to ascertain the weight and purity of a coin.
attribution
An identifier of a coin, such as date, mint, denomination, or variety.

B

[edit]
bag mark

Also called a contact mark.

A surface mark, or nick, on a coin, usually from contact with other coins in a mint bag.[1] More often seen on large gold or silver coins.
banker's mark
A small countermark applied to a coin by a bank or a trader indicating that they consider the coin to be genuine and of legal weight. These are found on ancient and medieval coins as well as on silver coins which circulated in China and Japan, where they are referred to as chop-marks.
base metal
Any non-precious metal or alloy that does not contain gold or silver. Common base metals used in coinage include nickel and copper.
beading
A raised dot border along the rim of a coin.
billon
A low-grade alloy of gold or silver with a high percentage of another metal, usually copper.[1] Billon is often produced in response to a sudden debasing of circulating silver coinage due to hyperinflation.
bi-metallic coin
A coin with one type of metal in the center with an outer ring of a different metal. Examples are the 1 and 2 Euro coins and the Canadian "toonie" two-dollar coin.
blank

Also called a planchet or flan.

1.  A prepared disk of metal on which the design for a coin will be stamped.[1]
2.  The un-struck or flat side of a uniface coin or medal.
brass
A copper-based alloy with zinc.
brockage
Originally referring to metal wasted in coin production, now means coins struck when the previous coin remains stuck to a die, creating an incuse impression in the next struck coin (primarily found in ancient coins).
bronze

Also abbreviated Æ[2] or AE[3].

A copper-based alloy with tin.
bullion
Precious metals (platinum, gold and silver) in the form of bars, ingots or plate, or in any context where weight is considered as a valuation.
bullion coin
Precious metals in the form of coins whose market value is determined by metallic content rather than scarcity.
bullion value
The current market value of the raw precious metal content of a coin. For example, the bullion value for Canadian silver coins minted between 1920 and 1966 is 12 times the face value when silver is $20.00 per troy ounce.
business strike
A coin intended for everyday use in commerce.

C

[edit]
cameo
A strong distinction in the surface appearance of foreground devices relative to the field. Proof coins often exhibit this feature.
carat
A unit measurement of the weight of precious stones. See karat for the unit of measurement of the purity of gold.
cast coins
Coins produced by pouring metal into a mold. Used for the first Ancient Roman bronze as coins and Chinese cash coins, but rarely used today. Modern counterfeit coins are often cast.
centum
One one-hundredth of the basic monetary unit of a currency system. Originally a Latin term, there are many variations in modern languages, including the English cent and Romance languages centavos, centimos, centesimos or centimes. Each of these units is valued at one one-hundredth of its corresponding base unit, such as the dollar, euro, peso, etc.
certified coin
A coin that has been graded and authenticated by one of numerous independent grading services.[1] See also encapsulated coin.
chop-mark
See banker's mark.
church tokens

Also called Communion tokens.

Tokens generally issued initially by Scottish parishes (die stamped one-side only to show the parish) and later in the United States and Canada. They were square or oblong, made of lead, iron or brass and measured 1/4" (0.635 mm) to 1" (2.54 mm).[4]
circulated
A term used to indicate a coin that has wear.
clad coinage
Issues of coins using cladding with a center core and an outer layer of differing metals or alloys bonded together. The current U.S. Quarter, dime, and half dollar are made of cupronickel-clad copper.
clipping coins
Describes the removal of, usually, precious metal from the edge of a coin using shears or a similar tool for fraudulent purposes. The removed metal could be accumulated as bullion and sold or used to make counterfeit coins.
coin alignment
The term used to describe the positions of the obverse (front) and reverse (back) designs relative to each other. A medal alignment describes a coin struck so that when the obverse side is facing upright, and the coin is turned on its vertical axis, the reverse side is also facing upright. A coin alignment describes a coin struck so that when the obverse side is facing upright, the coin must be flipped top-to-bottom to see the reverse side facing upright. U.S. coins are struck with coin alignment.
collar
The outer ring of the die chamber that holds the blank in place while the obverse and reverse are being stamped.
contact marks
Minor abrasions on uncirculated coinage created by contact with other coins.[1] Also called bag marks.
countermark

Also counterstamp.

Partial or complete over-stamping of a coin or token in order to change its value or issuing authority, or to display an advertisement, political slogan or symbol, etc. Stamping may consist of a number (value), symbol (authority), letters (advertisement or slogan), or any combination of the above.
crown
A large coin often struck in precious metal. Modern crowns are usually not highly circulated due to being too large and/or too heavy. The United States' last crown-sized coin minted for circulation was the Eisenhower Dollar, last struck in 1978.
cud
A defect in which a coin has raised metal near its edge. It is caused by a chipped die.[1]

D

[edit]
debase
To lower the silver/gold value of the coin by altering its purity, but with the same face value as the pure coin. This often happens during periods of high inflation.
denticles
Small, decorative tooth-like projecting points on the inside edge of a coin.[5]
designer
The artist or creator of a coin's design.[1]
device
A pattern or emblem used in the design of a coin.
die
An engraved metal piece used for transferring the design to the coin. In a vertical arrangement, the upper (or hammer) die is typically used for the obverse. The lower (or anvil) die is stationary and is used for the reverse. The arrangement may also be horizontal.[6]
die clash
Caused when a coin planchet fails to be placed between two dies during the minting process, causing the dies to smash together. The design of one or both may impress into the opposite die, causing a "shadow" of the design to appear on subsequent coins minted with the damaged dies. The impact of the two dies may also result in die cracks or defects.
die crack
A fine raised line on a coin that was caused by a crack in the die.[1]
die defect
An imperfection of various sorts caused by a damaged die. May refer to a crack or clash or a chip out of the die, etc. A defect from a chipped die is called a cud.[1]
die marriage
The combination of a particular obverse and reverse set of dies. If one die is replaced, a new die marriage is created.
die state
A variation in the appearance of a coin struck by a single die, resulting from wear or alteration of the die. For example, the presence or absence of die cracks may signal a specific die state.
die variety
A minor variation in a die, including repunched mintmarks, doubling or deliberate minor changes to the die design.
dime
A coin issued in the United States worth $0.10 (ten cents). While the term dime is American in origin, Canadians often use the term as well.
dipping
The chemical cleaning of a coin with a diluted acid. This "cleanliness" is a result of the surface of the coin being dissolved by the acid. Dipped coins almost always have a lower numismatic value than when they were in their former "dirty" state, hence most numismatists do not recommend dipping or any other method of cleaning coins as doing so will likely reduce the coin's value.
Double Eagle
(U.S.A.) A gold coin struck in the United States from 1850 to 1933, worth $20.00.
Example of extreme doubling on the date of a coin
double strike
A coin where a die is struck, bounced, and then struck again slightly offset from first strike (common on ancient and medieval coins where hubs were not used), resulting in a coin with a "doubled" image.
doubled die
A die that received two misaligned impressions from a hub; more commonly, a coin struck by such a die.[1]
doubloon
The popular name of a Spanish gold coin originally valued at 4 dollars. The formal term was "2 escudos".
dump
(Australia) The centre of the holey dollar with a value of fifteen pence.

E

[edit]
Eagle
1.  (U.S.A.) A gold coin minted in the United States from 1795 to 1933, worth $10.00.
2.  (U.S.A.) A series of bullion coins minted in the United States from 1986 through the present.
edge
The surface of the coin between the faces; the edge may be plain, ridged or patterned with lettering or other decoration.[1]
ecu
A large French silver coin made during the end of the monarchy. Also a proposed European currency unit.
effigy
The image or likeness of a person, usually depicted on the obverse of a coin or medal.
electrotype
A reproduction made by electrodeposition, frequently used in museum displays.[1]
electrum

Also abbreviated EL[7]

An artificial or naturally occurring alloy of gold and silver, used in some of the world's first coinage.
elongated coin
An oval medalet produced by a roller die using a coin, token or medal as a planchet, usually a cent.
encapsulated coin
A coin that has been authenticated, graded and enclosed in plastic by an independent service.[1]
engraver
A person who cuts the image of a design onto a die.[1]
error
An error that occurs in the production of a coin,[1] for example, due to an engraving or die-cutting error. Coin errors are often unique, although engraving errors can appear on all of the coins produced until the error is corrected resulting in error varieties.
essai, essay
A trial strike, also in currency a strike intended to test the design.
exergue

Also abbreviated ex.[7]

A segment of a coin design separated by a line (usually indicating the ground in the design) in which a legend is placed/inscribed.

F

[edit]
face value
The value that is written on a coin. For example, an American one-cent coin has a face value of 1 cent. A collectable coin or bullion coin is usually worth many times its face value.
fantasy issue
unofficial coin or paper note (not legal tender) made to honor a person or event, for advertising purposes, for humor, for artistic purposes, or to show how it might have looked had it been actually issued.
field
The background area of a coin not used for a design or inscription.[1]
filler
A coin that is very worn and/or damaged, but may still be included in a collection if it is a key coin.[1]
fineness
Purity of precious metal content expressed in terms of one thousand parts, e.g. 90% pure is expressed as .900 fine.[1] The purest gold bullion coin is .99999 fine.
flan
See blank.
fleur de coin (FDC)
A coin of exceptionally high quality, where quality is determined not just by wear of the coin in circulation but also by the wear and artistic quality of the dies from which it was minted. These factors are crucial for ancient coinage where variability was higher than in modern mints. See also grade.
flip strike
An error caused by the coin flipping over after being struck, and then struck a second time, resulting in each face of the coin showing a "ghost" of the opposite face.

G

[edit]
gem
A coin of exceptionally high quality or good condition, such as Gem Uncirculated or Gem Proof.
grade
The condition of a coin or the amount of wear that a coin has received. Common grade terms used in North America, from worst to best, are Poor (Po), Fair (Fr), About Good (AG), Good (G), Very Good (VG), Fine (F), Very Fine (VF), Extra/Extremely Fine (EF or XF), Almost Uncirculated (AU), Uncirculated (UNC), and Brilliant Uncirculated (BU). Grading criteria may also include color, strength of strike, and "eye appeal".

H

[edit]
Hacksilver
Fragments of cut and bent silver items that were used as bullion or as currency by weight in antiquity.
Hairlines
Small scratches or lines on coins, often caused by the process of cleaning or polishing.[8]
hammered
A coin that has been struck by hand, using dies and a hammer.[9]
high relief
A coin with the raised design high above the field. Coins struck in high relief often have problems with details not coming up sharp enough and dies having a shorter than usual lifespan. If the design is higher than the rim, the coin may not be stackable, and the highest points of the design will wear away very quickly.
holey dollar
(Australia) A Spanish eight-real coin with a hole in the centre, stamped with New South Wales 1813 on the obverse and five shilling on the reverse.
hub
A positive-image punch that impresses a coin's design onto a die.[1]

I

[edit]
incuse
Part of the coin's design that has been impressed below the surface (intaglio).[1] Not as popular as the "relief" method due to the difficulty of striking clearly and the shorter lifespan of dies.
ingot
A bar of pure metal formed by pouring the molten metal into a mould. It may be stamped with its weight and purity.
inscription
Lettering or wording on a coin.[1]
intrinsic value
The current market value of a coin based on its metallic content. For a coin struck on precious metals, this is the same as its bullion value.[1]

K

[edit]
karat
A unit measurement of the purity of gold. Usually marked K or k; 24K is pure gold, 18K is .750 fine. Not to be confused with the similar term carat, which is used with precious stones. Both terms originally referred to the seed of the carob tree (Ceratonia siliqua or Siliqua Graeca). A Roman coin called the solidus weighed 24 "carats" or "siliquae", 1/6 of a scruple, which eventually became the standard of purity in Western Europe.
key coin
A rarer or higher valued coin within a series.[1] As an example, 1923 and 1925 are key coins in the Canadian small cent series.

L

[edit]
laureate

Also abbreviated laur.[2]

A style of coin portraiture started in ancient Rome whose coins often showed the Emperor's head crowned with a laurel wreath. The American Barber coins from 1892 to 1915 and the first portrait of Queen Elizabeth II used in Great Britain from 1953 to 1967 are modern examples.
Coins or currency which must be accepted in payment of debt.
legend
The principal inscription on a coin.[1]
lettered edge
The outside edge of a coin containing an inscription.[1]
low relief
A coin with the raised design not very high above the field.
luster
The appearance of a coin's ability to reflect light; brilliance. Percentage of the original mint luster is one of the factors in determining grades of "Mint State" coins (e.g. MS-60, MS-65).

M

[edit]
master die
An original die from which working hubs are made.
Maundy money
An annual gift made on Maundy Thursday of a set of pure silver coins made by the Royal Mint and distributed personally by the monarch to the poor of Canterbury. The number of sets distributed reflects the age of the monarch at the time.[10]
medal alignment
A method of striking coins in which both the obverse and reverse dies are aligned in the same direction. For example, British and most other Commonwealth coinage, Japanese coinage, and Euro coinage have medallic orientation. Contrast coin alignment.
medal-coin
See NCLT.
milled coinage
Machine-struck coinage. In contrast to hammered coinage and cast coinage.
milled edge

Also called a reeded edge.

The edge of a coin with grooved lines around the perimeter.
mint
An industrial facility which manufactures coins.
mint error
A defective coin produced by a mint.[1]
mint luster
The shiny "frost" on the surface of an uncirculated or mint state coin.[1]
mint mark
A small letter or other symbol inscribed on a coin, indicating at which mint the coin was struck. Examples are "S" for San Francisco on U.S. coins, or "A" for Paris on French coins.
mint roll
Newly minted coins wrapped in rolls of a certain quantity, by the mint or issuing authority.
mint set
A set of uncirculated coins packaged and sold by a mint.[1]
Mint State (MS)
Another term for uncirculated or fleur de coin, usually used in North America. Conditions range from MS-60 to MS-70.
mis-strike
An off-centre striking of a coin.
monster box
A large plastic shipping box for silver bullion coins, holding 500 coins. U.S. Silver Eagles are shipped in green monster boxes while Canadian Maple Leafs are shipped in red monster boxes.
motto
An inspirational phrase or wording.[1] Examples include "In God We Trust" inscribed on U.S. currency, or "Liberté, égalité, fraternité" inscribed on French currency.
mule
A coin struck from two dies never intended to be used together.[1]

N

[edit]
NCLT
Non-circulating legal tender. These coins are issued in "limited editions" for collectors and are typically sold for far more than their face value. While these coins are technically legal tender, their bullion value usually far exceeds their face value.
Notgeld
"emergency money" or "necessity money" refers to money issued by an institution in a time of economic or political crisis.

O

[edit]
obverse

Also abbreviated obv.[2]

The front or "heads" side of a coin.[1]
overdate
A date shown made by superimposing numbers on a previously dated die.[1]
overgraded
A coin in worse condition than stated.[1]
overstrike
An impression with new dies on a previously struck coin.[1]

P

[edit]
Regular coin, essai (pattern) and piedfort
Pattern
A coin minted from official dies that is not a regular issue, and intended to evaluate new alloys or designs. Patterns can be divided in three categories.
1.  A coin which represents a new design, motto, or denomination, proposed but not adopted, at least for the same year. Most of the unadopted designs fit into this modality.
2.  Die trials: A coin made with the regular issue dies, in metals other than the proper. Usually minted to verify details of a new coin, value or design.
3.  Experimental pieces: A very similar process to "die trials", but with subtle differences. A coin minted with a die, official or not, to try a new metal, alloy, or shape.
patina
A surface film caused by oxidation, usually green or brown, mostly found on older silver, copper or bronze coins.
pedigree
The provenance or record of previous owners of a coin.[1]
piedfort
A coin struck on a planchet that is thicker than normal, typically twice as thick. "Piefort" is a common misspelling.
planchet
A blank prepared piece of metal on which the coin is struck.[1]
pocket piece
A coin kept on one’s person for sentiment, luck, or as a conversation piece.[11]
portrait
The obverse (front-side) image.[12]
post-mint damage
Damage or alteration to a coin that occurs after minting. May be mistaken for a true error coin.
privy mark
A small mark, often hidden, on a coin, traditionally to indicate the mintmaster or moneyer.
proclamation coins
Coins declared legal tender even though they are not issued by the sovereign, but by another sovereign.
2002 Lincoln cent, obverse, proof with cameo
proof
Coins specially struck for collectors using polished dies and planchets.[1] The resulting coins usually have a mirror field and raised areas are frosted in appearance.
proof set
A set of proof coins packaged and sold by the mint.[1]
punch mark
A coin struck from "punching" the coin with symbols or a seal, e.g. five punch marked coins of ancient India. Punch marks generally represent animals, tree, hills, and human figures. These coins were issued by royal authority and generally marked with banker's punches on the reverse.

Q

[edit]
Quarter
(U.S.A./Canada) A coin issued in the United States or Canada, worth $0.25 (twenty-five cents). Short for "Quarter Dollar".
Quarter Eagle
(U.S.A.) A gold coin issued in the United States, worth $2.50 (two dollars and fifty cents).[1]

R

[edit]
raw
A coin that has not been encapsulated by any coin grading service.[1]
reeded edge
See milled edge.
relief
The part of the coin's design that is raised above the field, opposite of incuse.[1]
re-strike
A coin struck from genuine dies at a date later than the original issue.[1] Some of the 1804 U.S. Silver Dollars were re-strikes.
repunched date
A coin variety on which the puncheon with which the date is applied to the hub has been used a second time, often to cover a first, failed attempt.
reverse

Also abbreviated ℞,[2] 𐅀𐅁[7] or rev.[3]

The back or "tails" side of a coin. The opposite of obverse.[1]
reverse proof
A proof coin that has its fields frosted and the design and lettering with a mirror finish. Standard proof coins have the fields mirrored and the design and lettering frosted.
rim
The raised portion of the design along the edge that protects the coin from wear.[1] It also makes the coins stackable and easy to roll by machine.
round
A round, one-ounce bullion piece, generally issued privately.

S

[edit]
series
A set of years in which a coin was minted with a specific design and denomination.[1]
scruple
One Roman scruple is equal to 1/24 Roman uncia; the modern (nominal) estimate of the weight of the Roman scruple is 1.125 grams.
seigniorage
The difference between the face value of a money and the cost to produce and distribute it. When a government issues new coinage, it earns the seigniorage in profit (or loss if negative).
silver dollar
A one-dollar coin minted in the United States until 1935, and in Canada until 1967. Dollar coins made after those dates are also sometimes called "silver dollars", although they are actually made of nickel or other metal. Dollar coins struck in Canada since 1987 are more commonly referred to as loonies because of the loon design on the reverse.
slab
The plastic case containing a coin that has been graded and encapsulated.[1]
Spanish dollar

Also called a piece of eight.

A coin issued in Spain and its colonies from 1497 to 1864, equal to eight reales. It was legal tender in the United States until 1857.
spot price
In numismatics quoted market value of one troy ounce of a precious metal in bullion form.
stainless steel
An alloy of iron, carbon and another element, usually chromium, that is resistant to rusting. Coins struck on stainless steel are very durable and maintain their shiny appearance, but the hardness of the metal requires that the coins have a low relief in order to prolong die life.

T

[edit]
A rare and historic Bechuanaland Border Police canteen token
token
A privately issued piece that has redeemable value for goods or services but is not an official government coin.[1] An example is a subway token.
tombac
A brass alloy that was used to make Canadian 5-cent coins in 1942 and 1943, during which there was a shortage of the usual nickel due to World War II. A shortage of copper forced a switch to chromium-plated steel in 1944.
trade dollar
Silver dollar issued specifically for trade with a foreign country.[1]
truncation
The sharply cut off bottom edge of a portrait or bust.[1] The coin engraver's initials are often found on the truncation.
type
A coin's basic distinguishing design.[1]
type set
One of each coin of a particular design, series, or time period.[1]

U

[edit]
uncirculated
A coin that has never been used, thus retaining all or most of its original luster.[1]
uniface
A coin struck with the design on one side only.
union
A proposed United States gold coin worth $100 (one hundred dollars). Only one pattern "half union" is known to exist. Platinum $100 coins are not technically "unions".
unique
An item of which only one is known to exist.[1]
upset
A coin struck on which the obverse and reverse are out of alignment.

V

[edit]
variety
Fine details of a coin's design which set it apart from the normal issue. Varieties arise as a result of intended (die variety) or unintended (mint-made error) alterations to the basic coin design that occur during the die production stage.

Y

[edit]
year set
A set of coins for any specific year containing one of each denomination of that year.[1]

Z

[edit]
zinc
A grey, inexpensive metal, usually alloyed with copper to make brass coins, but also used in pure form for emergency coinage when the usual coinage metal is not available due to war or other serious crisis. Much of the coinage struck in Nazi-occupied Europe was tin-plated zinc.

See also

[edit]

References

[edit]

Bibliography

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Glossary of numismatics

View on Grokipedia
from Grokipedia
Numismatics is the scientific study and collection of currency, encompassing coins, tokens, paper money, medals, and related monetary objects, with a focus on their historical, artistic, and economic significance. The term originates from the Greek nomisma, meaning "current coin" or "money in circulation," reflecting its roots in the examination of as a . A glossary of provides a standardized reference for the specialized vocabulary used in this discipline, enabling precise communication among collectors, historians, and appraisers. The scope of numismatics extends to the historical evolution of monetary systems, artistic designs on currency, and their economic roles in trade and society. Key subdisciplines include (the study of tokens, medals, and non-currency items), (the study of and banknotes), and scripophily (the study of stock certificates and bonds). These glossaries typically cover essential concepts in coin production, such as minting techniques, die varieties, and edge types, as well as grading standards like the Sheldon Scale, which numerically assesses a coin's condition from 1 to 70. They also define terms related to physical attributes (e.g., luster, toning, and strike quality), error classifications (e.g., die cracks or off-center strikes), and market designations (e.g., Mint State or Proof). By clarifying these terms, a numismatic supports accurate , valuation, and scholarly analysis, drawing from authoritative practices established by organizations like the .

Introduction

Definition of Numismatics

Numismatics is the scientific study and collection of , encompassing coins, tokens, , paper money, and other related objects that have served as media of exchange throughout history. This discipline examines these artifacts not only for their material composition and artistic merit but also for their roles in economic systems, cultural symbolism, and historical narratives, providing insights into past societies' trade, politics, and artistry. The term "numismatics" derives from the Greek word nomisma, meaning "current coin" or "currency," which entered Latin as numisma and was later adapted into French as numismatique before appearing in English around 1829. While the practice of collecting and studying coins predates the formal term, it was systematized in the late by scholars such as Joseph Hilarius Eckhel, whose multi-volume work Doctrina numorum veterum (1792–1798) established methodical classification based on , , and , laying the foundation for as a rigorous academic field. The origins of trace back to the period, when European intellectuals and nobility began systematically collecting and Roman coins as tangible links to , using them to reconstruct historical events and linguistic knowledge in an era before widespread . This hobby evolved into a formal discipline by the , marked by the establishment of dedicated societies; for instance, the American Numismatic Society was founded in 1858 to promote the preservation, study, and appreciation of numismatic objects. Numismatics distinctly focuses on the physical analysis and historical context of monetary artifacts.

Scope and Subdisciplines

Numismatics traditionally encompasses the study and collection of circulating coins, which serve as in everyday transactions, as well as bullion coins valued primarily for their content, patterns or trial strikes produced to test new designs, and error coins resulting from minting anomalies such as off-center strikes or die cracks. This scope extends to , defined as numismatic items other than coins and , including used for local trade or transportation, as emergency or company currency, and medals commemorating events or achievements without monetary function. These elements provide insights into , craftsmanship, and cultural symbolism from ancient civilizations to the . Key subdisciplines branch from this core, with offering a detailed focus on non-circulating substitutes like civil war tokens or wooden nickels that reflect localized economies. specializes in , examining banknotes for security features, historical issuance, and economic contexts, while scripophily involves the collection of and bond certificates as artifacts of corporate and financial . , the study of postage stamps and postal , maintains a tangential relation to numismatics through shared themes of official issuance and collectible memorabilia, often overlapping in exhibitions or investor interests. Across these areas, numismatics emphasizes historical coinage from ancient electrum trinkets in Asia Minor to contemporary milled pieces, tracing evolutions in metallurgy, design, and monetary policy. Emerging areas in 2025 integrate digital numismatics, where technology authenticates physical coins by embedding tamper-proof records, enhancing trust in high-value transactions. Collectible cryptocurrencies are increasingly treated as modern "tokens," with physical representations like cashed coins bridging virtual assets and traditional collecting. NFT-based replicas of historical coins, such as models for rare specimens, allow broader access to numismatic heritage without physical transfer. AI-assisted attribution employs to analyze coin imagery for origin, wear, and authenticity, accelerating the classification of large hoards. Global perspectives reveal variations in emphasis; European numismatics often prioritizes hammered coins from the medieval period, hand-struck on anvils to produce irregular silver and gold pieces that embody feudal artistry and regional mints. In contrast, American numismatics highlights mint errors, with collectors pursuing U.S. coins marred by production flaws like doubled dies or broadstrikes, reflecting industrial-scale minting challenges. These differences underscore how cultural and technological contexts shape numismatic pursuits worldwide.

Terms A–D

A

Adjustment
In numismatics, adjustment refers to the process of filing down metal blanks, known as planchets, to achieve the precise weight required before striking a coin, often resulting in visible file marks on the surface. These marks, termed adjustment marks, were particularly common on early gold and silver coins produced prior to 1840, as mints manually corrected overweight planchets to prevent debasement and ensure consistent value. In 19th-century U.S. Mint practices, this method was routinely applied to combat material inconsistencies, though it sometimes affected the coin's aesthetic appeal and collectible quality. Alliance coinage
Alliance coinage describes coins minted collaboratively by two or more sovereign states or governments, featuring shared designs to facilitate cross-border circulation and legal tender status. A prominent example is the introduction of in , where the European Union's member states produced coins with a common obverse side depicting unified European symbols, while national reverses incorporated country-specific emblems, allowing seamless recognition and acceptance throughout the . This cooperative approach enhanced by standardizing denominations and ensuring mutual validity across participating borders. Alloy
An in numismatics is a homogeneous of two or more metals designed to enhance a coin's durability, resistance to wear, and aesthetic properties for circulation. , composed of 75% and 25% , exemplifies a widely used modern , offering high conductivity for electromagnetic sorting in vending machines while providing resistance and a silver-like appearance. This composition balances cost-effectiveness with longevity, making it suitable for everyday transactional coins in numerous countries. Altered date
An altered date occurs when a coin's date is fraudulently modified, typically by or tooling, to mimic a rarer or more valuable variety and deceive collectors. This practice was prevalent in 19th-century , where forgers targeted common dates to fabricate key rarities, such as changing the '2' in an 1825 date to a '1' on U.S. half dollars to mimic the rare 1815/2 overdate. Detection involves to identify irregularities like uneven digit spacing, tool marks, or mismatched font styles compared to genuine mint products. Anepigraphic coin
An anepigraphic coin is one lacking any legends, inscriptions, or textual elements, relying solely on symbolic imagery for identification and value. In ancient contexts, such as Lydian coins from the BCE, these pieces often featured animal motifs like lions without accompanying text, reflecting pre-literate societies where visual symbols conveyed authority and cultural significance. This design choice emphasized the coin's intrinsic metal value and served as an early form of standardized exchange in trade-heavy regions like Asia Minor. Annealing
Annealing is the metallurgical process of heating coin blanks to a specific and then slowly cooling them to soften the metal, making it more malleable for striking and reducing the risk of cracks or fractures during minting. For silver alloys, this typically involves temperatures around 760–871°C (1400–1600°F) in an oxygen-free environment to prevent oxidation, followed by in a mild to remove surface impurities. This preparatory step ensures uniform , critical for achieving sharp details in high-relief coin designs without compromising structural . Assay
An is a precise to determine the purity, composition, and weight of a coin's metal content, ensuring adherence to legal standards and detecting counterfeits. The fire assay method, a traditional technique, involves dissolving the sample in acids or fluxes at high temperatures to separate precious metals like or silver from base impurities, providing accuracy to parts per thousand. For U.S. silver dollars, the standard is 0.900 (90% silver and 10% ), a benchmark established by the Mint Act of 1792 and maintained through the 19th and early 20th centuries to guarantee intrinsic value. Attribution
Attribution in numismatics involves identifying and classifying a coin's specific characteristics, such as mint of origin, production date, die variety, and condition, to establish its authenticity and . For early U.S. coins like large cents (1793–1814), the Sheldon catalog serves as a foundational reference, numbering 295 die varieties based on diagnostic markers like styles or letter spacings to differentiate subtle production differences. This systematic approach, developed by William H. Sheldon, enables collectors to assess rarity and , directly influencing valuation in auctions and grading services.

B

Bag mark refers to nicks, scratches, or abrasions on a coin's surface resulting from contact with other coins while stored in mint bags. These marks were particularly prevalent in pre-1960s U.S. Mint handling practices, where coins were transported in canvas bags, leading to friction that impacts the coin's overall grade and appearance. Banker’s mark, also known as a countermark, is a punch or stamp applied by bankers or merchants to verify a coin's weight and purity, often appearing as shapes like stars, letters, or symbols. In 19th-century Chinese tael systems, these marks were used in assays to confirm silver content in trade transactions. Such marks served to authenticate coins in circulation without full reminting. Base metal denotes non-precious metals such as , , or employed in the production of circulation coins to reduce costs while maintaining durability. Examples include the composition of modern U.S. pennies, which use a copper-plated core, and nickels made from a copper- alloy. These metals provide the structural integrity needed for everyday use without the expense of precious alternatives. Beading consists of raised dots encircling the rim of a , designed historically to deter clipping and filing by making tampering more evident. This feature evolved from denticles in ancient coinage to precise, laser-etched versions in contemporary minting, enhancing both security and aesthetic appeal. Beading remains a standard element in many modern coin designs to protect the edge against unauthorized alteration. Billon is a debased primarily of silver mixed with a high proportion of , typically containing less than 50% silver, used in medieval and emergency coinage during times of metal shortages. Its could drop as low as 0.250 fine silver, allowing governments to stretch limited supplies for broader circulation. Billon coins often exhibit a subdued luster due to the base metal dominance. Bi-metallic coin features a of two distinct metals, usually an outer ring bonded to a contrasting center, to enhance security against counterfeiting through the difficulty of replicating the precise metallurgical join. The 2-euro coin exemplifies this with a copper-nickel outer ring surrounding a nickel-brass center, providing both visual distinction and tamper resistance. This design originated in modern minting practices to combat forgery while allowing cost-effective material use. Blank, synonymous with planchet, is the unstruck metal disk prepared for coining, cut to specific dimensions based on the intended denomination. For instance, the blank for a U.S. quarter weighs approximately 5.67 grams and measures 24.26 mm in , ensuring uniformity in the striking process. Blanks undergo annealing and edging before entering the coining press. Brass is a - , typically around 70% and 30% , utilized in and some commemorative pieces for its golden yellow hue and corrosion resistance. This composition distinguishes from by the absence of tin, offering a brighter finish suitable for non-circulation items. has been employed in since ancient times for subsidiary coinage. Brockage is a striking occurring when a previously struck adheres to a die, imprinting an incuse, mirror-image onto the subsequent blank. These errors are rarer in ancient hammered coins due to manual production methods, but they provide intriguing insights into minting mishaps. A full brockage covers the entire surface, while partial ones show only portions of the inverted . Bronze comprises a -tin alloy, commonly 95% and 5% tin in ancient coinage, valued for its strength and workability in producing durable circulating pieces. Over time, coins develop a , a natural layer that protects the surface and adds to their aesthetic and historical appeal. Modern formulations may vary slightly for specific mint requirements. Bullion represents refined , such as or silver, valued purely by its weight and purity rather than any numismatic premium. Its worth is determined by prices, which fluctuate based on global factors. Bullion in coin or bar form serves primarily as an investment vehicle. Bullion coin is struck from with a nominal , but primarily traded at the prevailing spot price of its metal content. The , containing 1 troy ounce of pure with a $50 , exemplifies this category, appealing to investors for its intrinsic worth over collectible appeal. These coins often feature anti-counterfeiting measures like reeded edges. Bullion value, or melt value, calculates the current market price of a coin's contained by multiplying its weight, purity factor, and spot price per unit. This intrinsic value underpins investment decisions, often exceeding in coins. Formulas for this assessment are standard in numismatic appraisals. Business strike describes coins produced for general circulation, featuring a matte finish from high-volume minting presses, in contrast to the mirror-like proofs made for collectors. These strikes prioritize efficiency and durability over aesthetic perfection, resulting in subtle surface variations. Business strikes form the bulk of a mint's output for everyday economic use.

C

Cameo refers to a proof featuring high contrast between frosted devices and a mirrored field, achieved through specialized minting techniques that deposit frost on raised elements while polishing the background. The degree of contrast is graded on a scale from cameo (moderate frost) to ultra cameo (deep, pronounced frost covering most devices), with designations applied by services like NGC after the numeric grade. PCGS uses similar terms, such as deep cameo for coins with heavily frosted devices contrasting sharply against the field. Carat, in numismatics, denotes a measure of gold purity where 24 carats represent 100% pure , so a 22-carat coin contains 22/24 or 91.67% by weight. This system differs from the metric carat used for weight, which equals 200 milligrams, as the purity karat (often spelled "karat" in ) specifically quantifies alloy composition in coins. Historically, the term derives from seeds used as weight standards, but in coinage, it standardizes for alloys like those in ancient and modern issues. Cast coins are produced by pouring molten metal into molds, a method used for primitive currencies like ancient Chinese or as counterfeits imitating struck coins. These often exhibit porous surfaces, irregular edges, and low relief due to cooling imperfections, serving as key detection clues against genuine struck pieces. In , cast fakes remain common for ancient replicas, distinguishable from originals by their soft details and lack of die striations. Centum, from Latin meaning "one hundred," forms the etymological basis for the cent or as a 1/100th subunit, originating in Roman coinage where the as was divided into centesimal parts. This structure influenced modern denominations like the U.S. cent, introduced in 1793 as a hundredth of a , reflecting Roman precedents in fractional accounting. Certified coin undergoes and grading by third-party services such as PCGS or NGC, which encapsulate it in a tamper-evident slab with a stating the grade, authenticity, and details. The process involves expert examination for genuineness, condition, and alterations, using the Sheldon 1-70 scale, ensuring buyer confidence in market transactions. Over 40 million coins have been certified by PCGS alone, standardizing valuation in . Chop-mark consists of punched or symbols applied by Asian merchants to verify the weight, silver content, and authenticity of foreign coins, particularly 19th-century U.S. dollars. These marks, often irregular and clustered, served as a banker's endorsement in East Asian until the early , now valued by collectors for their historical context. Unlike official countermarks, chop-marks were private validations, sometimes reducing a coin's aesthetic grade but enhancing its appeal. Church tokens, issued by parishes from the 17th to 19th centuries, facilitated distributions or communion access in Reformed traditions, typically made of lead or with simple inscriptions. In and colonial America, these square or rectangular pieces proved eligibility for or the Lord's Supper, reflecting ecclesiastical administration amid coin shortages. Examples include tokens from English parishes, valued today for their socio-religious history rather than monetary use. Circulated describes a coin exhibiting wear from handling and commerce, graded on the Sheldon scale from (poor, barely identifiable) to 59 (about uncirculated, trace wear), with common levels like G (Good, major details visible) to VF (Very Fine, moderate wear). This contrasts with uncirculated (60+), emphasizing friction on high points; the scale, developed by William Sheldon in 1949, standardizes assessment for circulated U.S. coins. Wear patterns, such as flattened luster or smoothed devices, determine precise grading. Clad coinage employs layered metals for economy, such as the U.S. quarter's core bonded to faces (75% , 25% ), introduced in 1965 via the Coinage Act to end silver use in dimes and quarters amid shortages. This sandwich construction, recommended by , conserved precious metals while maintaining appearance; half dollars retained clad silver until 1970. Modern clad coins, like Eisenhower dollars from 1971, feature similar bonding for durability in circulation. Clipping coins involved shaving or filing edges of to steal , a prevalent medieval punishable by execution, as seen in 13th-century . This prompted the adoption of milled edges in the 17th century under at the Royal Mint, with uniform deterring tampering. Clipped coins often show irregular margins, now collectible as historical artifacts of economic . Coin alignment specifies the rotational orientation between obverse and reverse designs, with "coin type" featuring 180-degree rotation (standard for U.S. circulating coins, where flipping vertically aligns both sides upright). In contrast, "medal alignment" orients designs upright when rotated horizontally, common in British and commemorative issues. This die axis convention, measured in clock positions, affects collector preferences and error identification. Collar is the cylindrical ring encasing the during striking, constraining metal flow to protect dies, ensure planchet centering, and imprint edge features like . In U.S. minting, segmented collars allow high-speed production for reeded edges on and dimes, while plain collars suit smoother types. Malfunctions, such as partial collar strikes, produce off-center errors with broadened rims. Contact marks are minor abrasions, nicks, or scratches incurred from post-mint handling in bags or storage, impacting uncirculated grades by dulling luster or focal areas. In gem uncirculated coins (MS-65+), these are minimal and light, often 3-4 minuscule marks without hairlines; heavier contact reduces grade to MS-60 or below. Bagmarks, a subset, arise from mint bagging friction. Countermark is an official punch or stamp applied to a preexisting to revalidate it, adjust denomination, or authorize circulation, common in antiquity to combat wear or shortages. Roman examples include star-shaped countermarks on Republican denarii, signaling provincial acceptance during the late . These overstamps, often symbolic like eagles or letters, distinguish from private chop-marks by their governmental intent. Crown denotes a large British valued at five shillings (1/4 pound), typically struck in silver or from the , symbolizing prestige in historical denominations. The Gothic Crown of (1902) exemplifies ornate design, while earlier issues like Henry VIII's crowns facilitated high-value trade. Post-decimalization, crowns became non-circulating commemoratives, retaining the name for ceremonial issues. Cud arises from a die chip or break, forming a raised, blob-like area on the where missing die material fails to impress the , often progressing from an initial crack. Marginal cuds, involving the rim, appear as smooth, curved extrusions; interior cuds create irregular lumps on devices. These errors, valued in error collecting, indicate die fatigue after prolonged use.

D

Debasement refers to the practice of reducing the content in , typically by lowering the purity or weight while maintaining the , often to generate profit for the issuing . This was common in ancient economies, such as in the , where the silver , initially nearly pure silver (around 0.950 fine), was progressively debased starting under in 64 CE to about 0.900 fine, and by the 3rd century during the Crisis of the Third Century, the —a successor —had its silver content drop to as low as 0.050 fine or less. Such debasements led to severe economic consequences, including , loss of public trust in the currency, increased prices, and social unrest, as the reduced intrinsic value eroded and encouraged of older, purer . Denticles are the small, tooth-like projections or ornaments along the inner edge of a coin's rim, serving both decorative and anti-clipping purposes on earlier age. They represent a variant of outer beading, commonly seen on older U.S. coins like pre-1930s issues, where the raised, rounded teeth enhance the border design and protect the coin's edge from wear or tampering. The designer of a is the or engraver responsible for creating the principal motifs, portraits, or emblems that appear on its . A notable example is , who designed the obverse portrait of for the U.S. introduced in 1909, marking the first U.S. circulating to feature a president's likeness and influencing modern numismatic art. A coin's device denotes the main raised design elements, such as portraits, emblems, or symbols like an eagle, which are the focal points of the coin's artwork. In die preparation, these devices are engraved in negative relief, meaning the raised areas on the struck coin correspond to recessed areas in the die, ensuring sharp detailing during minting. The die is a hardened steel cylinder engraved with the negative image of one side of a coin's design, requiring a pair (obverse and reverse) to strike coins under high pressure. Modern U.S. Mint dies, made from alloy steel and hardened to withstand repeated use, can produce varying numbers of strikes depending on the denomination; for instance, a penny die averages about 1 million impressions, while a dime die lasts for roughly 275,000 strikes before retirement due to wear. A die clash occurs when the obverse and reverse dies collide without a in place, transferring faint impressions of opposing elements onto each die, which then appear as ghost-like images or "clash marks" on subsequently struck coins. These marks, often subtle and located where devices overlap, are diagnostic for variety attribution and do not harm the coin's value unless excessive. Die crack manifests as a thin, raised radial line on a coin's surface, resulting from stress fractures in the die caused by prolonged use or metal fatigue during striking. As the crack progresses in advanced stages, it can lead to a die break, forming a ""—a blob of raised metal where part of the die has chipped away—significantly altering the coin's appearance and marking the die's terminal state. A die defect encompasses any damage or imperfection in the die, such as cracks, chips, gouges, or polishing marks, that transfers irregularities to struck coins and influences their classification as varieties or errors. These defects arise from manufacturing flaws or operational wear and are scrutinized in grading to assess authenticity and condition. Die marriage describes a specific pairing of an obverse die with a reverse die used to produce coins in a given year or series, each unique combination cataloged for attribution. For example, in the series (1878–1921), numerous die marriages are documented, allowing collectors to identify subtle differences in design alignment or wear patterns across specimens. Die state refers to the progressive condition of a die throughout its production life, categorized as early (EDS, with sharp details and no wear), middle (MDS, showing initial deterioration), or late (LDS, with pronounced wear, cracks, or clashes). Collectors use die states to sequence emissions within a variety, as advancing states reveal evolving imperfections like softening of devices near the rim. Die variety pertains to minor but intentional or unintentional differences in die-engraved details, such as repunched s (RPMs), where the mint mark punch is applied off-center and repunched, creating offset impressions visible under magnification. These varieties are extensively cataloged in references like the Cherrypickers' Guide to Rare Die Varieties, which identifies and values significant examples across U.S. series, emphasizing their appeal to variety specialists over major errors. The dime, a U.S. 10-cent coin, has been issued in various designs since 1796, with the modern (1946–present) featuring a of on the obverse. Pre-1965 Roosevelt dimes were composed of 90% silver and 10% copper, containing 0.0723 troy ounces of pure silver, after which clad composition (copper-nickel over copper core) was adopted to conserve precious metals. Dipping, the practice of immersing in mild acid solutions like dilute acetic acid to remove toning or surface contaminants, is widely discouraged in as it strips natural and luster, causing microscopic pitting that permanently damages eye appeal and . Grading services such as PCGS classify heavily dipped coins as "cleaned" or "improperly cleaned," often assigning Details grades rather than numeric ones, as the process alters the original surface integrity. The is the U.S. $20 minted from 1849 to 1933, containing 0.9675 troy ounces of pure gold (90% gold, 10% copper alloy) and serving as a major international trade piece during era. The renowned Saint-Gaudens design, introduced in 1907, features Liberty striding on the obverse and a heraldic eagle on the reverse, embodying high-relief artistry until production halted amid the . A double strike error happens when a planchet is struck more than once in the coining press, often due to a malfunction preventing ejection, resulting in offset or overlapping impressions from the second strike. If the second strike occurs without the collar confining the planchet, it produces a broadstrike variant, where the expands irregularly beyond its standard diameter. Doubled die varieties arise from errors during die hubbing, where the hub—bearing the positive design—is pressed into the steel die multiple times with slight misalignment, causing thickened, doubled elements like or dates on all coins struck from that die. The iconic 1955 Obverse exemplifies this, with dramatic doubling on the motto and date due to hubbing shifts, making it one of the most recognized and valuable U.S. error coins, with fewer than 25,000 estimated survivors from its mintage. The , a Spanish equivalent to 2 escudos, was struck from the 16th to 19th centuries with a standard weight of approximately 6.77 grams at 0.875 , yielding about 0.190 ounces of pure , and gained legendary status in as "pirate treasure" from recoveries like the 1715 Fleet. Its pillar-and-cross design symbolized Spanish colonial power, and examples remain sought after for their historical ties to exploration and buccaneering lore.

Terms E–K

E

Eagle
In numismatics, an eagle refers to the $10 authorized by the and minted from 1795 to 1933, with the Liberty Head design featuring a seated on the obverse introduced in 1838 by engraver Christian Gobrecht. The modern , containing one troy ounce of 22-karat gold, was first issued in 1986 as part of the American Eagle program, with obverse designs inspired by ' 1907 featuring and reverse designs by Miley Busiek showing a nesting eagle . Edge
The edge is the narrow third surface of a coin, distinct from the obverse and reverse faces, often featuring security or decorative elements such as plain (smooth), reeded (grooved lines to deter clipping), lettered (inscribed text like "E PLURIBUS UNUM"), or other variations to prevent counterfeiting and enhance grip. Écu
The écu (or ecu) was originally a French gold coin first minted in 1266 under Louis IX, depicting a shield with the royal arms, later evolving into silver versions during the medieval period with fluctuating values tied to economic conditions; it was reintroduced in 1385 by Charles VI in a simpler form. In the 20th century, the European Currency Unit (ECU), named after the historical coin, served as a basket currency from 1979 until 1999, acting as a precursor to the euro with its value based on a weighted average of member state currencies. Effigy
An on a is the principal or representational image, typically of a , ruler, or allegorical figure like , positioned on the obverse and oriented according to conventions such as "heraldic" (right-facing for authority) or "profile" views to convey legitimacy and symbolism. Electrotype
An electrotype is a reproduction of a or created through , where a conductive mold of the original is coated with in an electrolytic bath to form a thin shell, often backed with additional metal; widely used in the 19th century by museums like the for study replicas and sometimes as deceptive fakes due to their accurate replication of details but lighter weight. Electrum
Electrum is a naturally occurring alloy of and , typically containing 40-90% with trace , known for its pale yellow color; it was used for the earliest coins originating in around 600 BCE, such as lion-and-sun punch-marked staters from , valued for its durability and scarcity from river deposits like the . Elongated coin
An is a genuine circulating , often a , that has been mechanically flattened and embossed with a new incuse using a rolling mill, primarily as a or commemorative item at tourist sites, events, or expositions since the late . Encapsulated coin
An encapsulated coin is a certified numismatic item sealed within a tamper-evident holder, known as a slab, typically sonically welded to protect against handling damage and verify authenticity and grade by services like NGC or PCGS. Engraver
An engraver in is an artist or artisan who prepares dies by hand-cutting or digitally sculpting designs in bas-relief on steel hubs and working dies, historically using tools like burins; notable examples include U.S. Mint chief engraver Charles E. Barber (1880-1917), who designed the Barber series, contrasting with modern computer-aided methods. Error
An error coin results from any anomaly in the minting process due to human or mechanical mistakes, including die errors (misaligned or cracked dies), planchet errors (improper blanks like wrong metal or size), and striking errors (off-center or incomplete strikes), which are collected for their rarity despite being production rejects. Essai (Essay)
An essai, or essay, is a trial strike or experimental coin produced to test a proposed design, composition, or striking quality for approval before full production, often unique or in limited numbers and bearing the French term "essai" inscribed; these differ from patterns by focusing on technical trials rather than aesthetic proposals. Exergue
The exergue is the lower segment of a coin's , typically on the reverse, separated from the main field by a horizontal line, used to inscribe secondary elements such as the date, , or value for clarity and organization in classical and modern coinage.

F

In , terms beginning with "F" often relate to a coin's nominal value, production processes, composition, and condition or errors encountered during minting. These concepts are essential for collectors assessing authenticity, quality, and market worth. Face value refers to the nominal monetary denomination inscribed on a , indicating its intended value for circulation, such as "ONE " on a U.S. silver . This value typically differs from the coin's numismatic or intrinsic metal worth, especially for rare or pieces. Fantasy issue denotes an unofficial, non- or produced by private mints, often replicating historical designs for promotional, artistic, or commemorative purposes without intent to deceive as . These items are distinct from counterfeits, as they are transparently non-circulating replicas. The field is the flat, unraised background area of a coin surrounding the principal design elements, or devices, such as portraits or emblems. The polish and finish of the field during minting influence the coin's overall luster and reflectivity, with smoother fields enhancing visual appeal in higher grades. A filler is a low-grade or imperfect coin temporarily acquired by a collector to occupy a slot in an album or set until a superior example can be obtained, serving as a placeholder without long-term value in the collection. Such coins are often circulated or damaged but confirm the date and type needed for completeness. Fineness measures the purity of a coin's metal , expressed as a or indicating the proportion of , such as .900 signifying 90% pure silver with 10% . This specification is commonly stamped on coins to verify composition for investors and assayers. Flan is an alternative term, particularly in British and ancient , for the metal disk or blank prepared before striking, often irregular in shape for hammered coins from antiquity. Unlike modern uniform planchets, ancient flans could exhibit natural variations in thickness or edges due to hand-casting methods. Fleur de coin (FDC), translating from French as "flower of the die," describes a coin in pristine, uncirculated condition with exceptional strike quality, full original luster, precise centering, and minimal or no post-mint imperfections, akin to the highest Mint State grades. This term emphasizes perfection straight from the mint, often applied to proofs or specially struck pieces. A flip strike is a rare mint error occurring when a coin flips over between successive strikes in the press, resulting in a double impression where elements from both obverse and reverse appear on each side, typically in medal alignment. These errors are scarcer than standard double strikes and valued for their unusual orientation.

G

In numismatics, terms beginning with "G" primarily pertain to the assessment of a coin's condition and , with "" denoting exceptional preservation and "grade" referring to the standardized evaluation process. These concepts are central to determining a coin's , as higher grades command premium prices due to minimal wear and superior eye appeal. The Sheldon Scale, developed by Dr. William H. Sheldon in 1949, provides the foundational framework for modern grading, particularly for coins, assigning numerical values from 1 (poor) to 70 (perfect) based on factors such as surface marks, luster, and strike . A "gem" coin represents a top-tier uncirculated specimen, typically graded MS-65 or higher on the Sheldon Scale, characterized by brilliant, undulled surfaces with very few contact marks and outstanding luster. This adjectival term, often abbreviated as Gem Uncirculated (Gem BU) or Gem Mint State, emphasizes coins that exhibit near-perfection in preservation, free from the circulation wear seen in lower grades. For proof coins, "gem proof" similarly applies to those graded PF-65 or higher, featuring high-quality mirror-like fields and sharp devices with only minor hairline scratches, distinguishing them from standard proofs through their exceptional finish and minimal imperfections. Examples include a 1900 certified as Uncirculated MS-65, prized for its blazing white surfaces and strong strike. The "grade" of a is a formal condition assessment using the 1–70 Sheldon Scale, where Mint State (MS) grades range from MS-60 (basic uncirculated) to MS-70 (flawless, with no imperfections visible under 5x magnification). Grading evaluates multiple attributes, including the sharpness of the strike (how fully the design details are impressed), luster (the reflective quality of the metal surface), and the presence of marks or scratches from handling or production. For instance, an MS-70 must show full original mint luster, complete strike, and zero post-mint damage, making it exceedingly rare and valuable. This , adopted by major services like NGC and PCGS since the 1980s, standardizes evaluations to ensure consistency across the numismatic market. By 2025, advancements in have introduced tools that assist in preliminary , enhancing accessibility for collectors while complementing human expertise from services like PCGS and NGC. AI-powered apps such as CoinSnap and CoinsWorth utilize image recognition to analyze photos of coins, estimating grades based on surface condition, luster, and wear patterns with up to 99% accuracy for identification but approximate and less reliable results for grading on the Sheldon Scale. These tools, leveraging models trained on vast databases of certified coins, offer low-cost options for bulk or casual assessments, particularly for mid-value modern coins, though they cannot replace third-party certification for high-stakes transactions and have limitations in detecting subtle errors or toning. For example, CoinSnap's AI evaluates factors like contact marks and strike quality in seconds, providing users with grade estimates and market values.

H

Hacksilver
Hacksilver refers to fragmented pieces of silver objects, such as jewelry, ingots, or tableware, that were cut or broken into irregular shapes and used as a form of by weight rather than face value. This practice was prevalent during the (c. 793–1066 CE), where silver served as the primary in a economy, often weighed on scales during transactions to determine purity and value. Viking hoards frequently contain hacksilver alongside coins, illustrating its role in storing and circulating wealth before the widespread adoption of coined money. Hairlines
Hairlines are fine, shallow scratches on a coin's surface, typically resulting from improper , wiping with a cloth, or mishandling, which can dull the luster and affect eye appeal. These marks are often incuse and not visible to the but become apparent under 10x , distinguishing them from deeper abrasions or die polish lines. In , minor hairlines may allow for a straight grade from services like NGC or PCGS, but excessive ones can lead to details grading or lower assigned values. Hammered
Hammered coins are those produced by hand-striking a metal blank between two dies using a and , a manual technique that dominated production from the invention of coinage around 660 BCE until the mid-16th century in most regions, and until 1662 in . This method often resulted in irregular strikes, off-center designs, and low relief due to the variable force of blows, limiting output to small-scale production by moneyers in workshops. The process required placing a blank on a fixed lower die and striking the upper die, imprinting designs on simultaneously. High relief
High relief in numismatics describes coin designs where the raised elements (devices) project significantly above the field or background, often more than half the height of the motif, creating a dramatic three-dimensional effect through undercutting and deep striking. This requires greater pressure during minting to fully transfer the die's details, as seen in the 1907 $10 Indian Head Eagle, where Augustus Saint-Gaudens' motifs of Liberty and an Indian headdress stand out prominently against the field. Such coins enhance visual impact but can be challenging to strike without multiple blows or specialized presses. Holey dollar
The holey dollar is a modified Spanish silver eight-real , with its center punched out to create a doughnut-shaped piece valued at five shillings, introduced in 1813 by Governor to combat currency shortages and prevent the export of imported Spanish dollars. Approximately 40,000 Spanish reales, shipped from Madras and arriving in late 1812, were altered by convict forger William Henshall at Sydney's first mint, with counterstamps reading "NEW SOUTH WALES 1813" on both sides; circulation began in 1814 and ended with demonetization in 1829. The removed center plugs, known as dumps, were valued at 15 pence each, effectively doubling the colony's supply. Today, fewer than 300 holey dollars survive.

I

Incuse refers to a design element on a coin where the motif is impressed or hammered below the level of the surrounding field, creating a sunken or intaglio effect, in contrast to raised . This technique was commonly employed in ancient coinage production, particularly through hammering the metal between dies, as seen in early staters from Greek city-states like around 600–550 BCE, featuring a on the obverse and incuse punches on the reverse. The incuse style originated in the Archaic period to ensure the adhered firmly to the flan during striking, preventing slippage, and persisted in regions like and for its aesthetic and practical advantages in early minting without modern presses. Ingot, in numismatic contexts, denotes a cast bar or block of metal, typically gold or silver, produced by pouring molten material into a mold for use as bullion, currency precursor, or raw material for coin blanks. These were essential in historical economies, such as during the California Gold Rush, where private and state assay offices melted placer gold into ingots to standardize weight and purity. Ingots often bear assay stamps indicating fineness, weight, and value, as exemplified by U.S. Assay Office pieces from 1855 marked with partial stamps for verification and trade facilitation. Unlike finished coins, ingots served as intermediaries in the monetization process, with their value derived directly from metal content rather than artistic or denominational features. Inscription encompasses the textual legends or wording stamped onto a coin's surface, conveying information such as issuing authority, denomination, date, or , often integral to the coin's identity and status. In U.S. coinage, a prominent example is "," the Latin meaning "Out of many, one," adopted in and first appearing on coins in 1795, mandated on most circulating coins by the to symbolize national unity. Ancient and medieval inscriptions frequently employed abbreviating conventions to conserve space on small , such as ethnic names reduced to initials or symbols in Greek coinage (e.g., "AΘ" for ) or Roman magistrates' titles shortened in legends. These conventions, standardized in epigraphic practices like the Leiden system for Greek numismatics, facilitated rapid identification while adhering to die space limitations. Inscriptions may appear on obverse, reverse, or edges, evolving from simple sovereign names in early coinage to complex phrases reflecting political or cultural motifs. Intrinsic value represents the monetary worth of a coin based solely on the market price of its metal content, disregarding collectible, historical, or artistic premiums that elevate numismatic value. For bullion coins like the , intrinsic value equates to the spot price of one troy ounce of silver multiplied by purity (0.999 fine), typically forming the baseline for . This contrasts with numismatic premium, which adds value from rarity, condition, or —such as a rare 1916-D commanding thousands despite its modest silver melt value of about $3.50 in 2025. Collectors assess intrinsic value during market fluctuations to determine if a coin trades at bullion parity or exceeds it due to demand, ensuring informed decisions in auctions or sales.

J

In numismatics, a jetton (also spelled jeton or known as Rechenpfennig in German) is a coin-like token primarily used as a counter for arithmetic calculations and during the medieval and early post-medieval periods. These metal discs, often featuring intricate designs and inscriptions, facilitated on counting boards or cloths divided into grids, a practice essential before the widespread adoption of and paper-based ledgers in the . Jettons emerged in the mid-to-late , initially in and , where they aided merchants and officials in complex financial computations without relying on scarce writing materials. Typically struck from alloy or , jettons were not intended as but as practical tools, though some silver examples exist, particularly from later periods or overseas production. Their designs often mimicked contemporary coinage, such as royal busts or symbolic motifs like crowns and fleurs-de-lis, to evoke familiarity and authority. Production centers shifted over time: early medieval jettons came from (late 13th to mid-14th century) and (mid-14th to 15th century), with Tournai emerging in the 15th to early 16th century; however, in became the dominant hub from the late medieval era onward, accounting for approximately 70% of known finds due to its efficient mass-production techniques under guild masters like Hans Schultes and Hans Krauwinckel II (active 1586–1635). By the post-medieval period, 's jettons flooded European markets, including and , outcompeting local makers with affordable, standardized issues like the iconic rose-and-orb type, which bore legends such as GROSER NEVRINBERG (Greater ). While their primary role in commerce waned by the 1630s, jettons persisted into the and beyond as gaming counters (Spielmarken) for card games or as commemorative pieces marking historical events, blending utility with ornamental value. Archaeological evidence from sites like Historic Jamestowne in highlights their transatlantic spread, underscoring their role in early colonial accounting. A jugate portrait, in numismatic , refers to a element where two or more figures are depicted side by side, often overlapping or conjoined, with their profiles facing the same direction to symbolize unity, , or shared purpose. This compositional technique, derived from Latin jugatus meaning "yoked together," emphasizes relational bonds, such as between rulers, deities, or historical figures, and has been employed across ancient, medieval, and modern coinage to convey political or ideological messages without requiring additional text. In American numismatics, the jugate format gained prominence in commemorative issues, where it highlighted Franco-American ties during the Revolutionary era. A prime example is the 1900 Lafayette silver dollar, the first U.S. to feature a non-presidential figure; its obverse shows jugate busts of and the Marquis de Lafayette facing right, derived from established medal portraits, to honor their partnership in the fight for . Minted in a limited run of 36,000 pieces at the on December 14, 1899, the coin's design by Charles E. Barber reinforced themes of enduring alliance and gratitude, with proceeds funding a Lafayette monument in . This motif later appeared in other U.S. issues, like the 1937 Antietam , but the Lafayette dollar remains iconic for introducing jugate portraits to official , marking a shift toward more narrative-driven commemoratives.

K

In numismatics, the term karat (often abbreviated as K) denotes a measure of the purity or of in a coin or other metallic object, expressed as parts per 24. Pure is defined as 24 karats, meaning 24 parts out of 24 total parts, or 99.9% to 100% fine with no ing elements. This originated from ancient practices of dividing purity into 24 units, allowing for precise compositions in coinage to balance durability and intrinsic value. For instance, many modern bullion coins, such as the American Buffalo, are struck in 24-karat , achieving .9999 for maximum purity. A common denomination is 14 karat, which signifies 14 parts out of 24, equating to 58.3% pure (or 14/24 × 100). This level of provides sufficient content for value while incorporating alloys like or silver to enhance and resistance, making it suitable for circulating coins or medals. Historical U.S. gold coins, such as those from the early , often featured levels approximating 21.6 karats (90% ), but karat markings on numismatic items today help collectors assess melt value and authenticity. Importantly, karat differs from carat, the latter being a unit of weight (200 milligrams) used for gemstones embedded in coins or medals, preventing confusion in valuation. This distinction parallels the broader concept of in , where purity metrics ensure standardized quality across metals. The term key coin refers to the rarest or most valuable coin within a specific series or type set, often due to extremely low mintage, historical significance, or survival challenges, making it essential for completing a collection. Typically, it is the lowest-mintage issue or the one commanding the highest price, serving as a benchmark for the series' overall desirability among numismatists. A classic example is the 1916-D , with a mintage of just 264,000 pieces, which has become a collector priority due to its scarcity and role in defining the series' key dates. Key coins drive market dynamics, as their fixed supply sustains demand; for instance, the 1909-S VDB Lincoln cent, another iconic key, exemplifies how such pieces appreciate over time as "blue chip" investments in numismatics. Collectors prioritize them to achieve set completion, often grading and preserving them meticulously to maximize value.

Terms L–P

L

In numismatics, a portrait depicts a figure, typically an or , adorned with a encircling the head, symbolizing victory, authority, and poetic or martial achievement in classical traditions. This style originated in and became a hallmark of Roman imperial coinage, where it conveyed the ruler's divine favor and legitimacy without implying full deification. For instance, frequently appeared with a laureate head on his aurei and denarii, such as those struck around 27–14 BCE, emphasizing his role as a triumphant founder of the empire. The refers to the principal inscription or lettering on a , often arranged circumferentially around the obverse or reverse designs to identify the issuing authority, ruler, or commemorative theme. In most modern coinage, legends read clockwise when viewed from the obverse, facilitating and in production. Examples include "" on U.S. coins or "CAESAR AVGVSTVS" on Roman issues, where the text serves both decorative and informational purposes. A lettered edge describes the rim of a inscribed with raised or incuse , symbols, or mottos, a feature introduced to deter clipping and by making alterations more detectable. This anti-tampering measure appeared on early U.S. silver coins, such as the 1794 with "" or certain half dollars inscribed "GOD * WE TRUST," and persists in modern issues like Presidential dollars. The inscriptions are typically applied during the minting process via a collar die, ensuring even distribution around the edge. Low relief denotes a coin design where the raised elements (devices) project only shallowly above the field, typically less than 1 mm, to facilitate high-volume striking and reduce die wear in mass production. This contrasts with high-relief coins, which feature more pronounced elevations for artistic depth but require greater pressure and are costlier to produce at scale. Notable examples include the 1922–1935 Peace dollars, where the U.S. Mint adopted low relief to improve output after the challenges of the 1921 high-relief version. Luster is the original, reflective sheen on an uncirculated coin's surface, arising from the microscopic flow lines and texture imparted during striking, which scatter light to create a cartwheel effect of radiating brilliance. This mint bloom, often described as frosty or satiny, diminishes with handling or circulation, serving as a key criterion in grading Mint State coins for authenticity and condition. In coins, luster contributes to designations like (RD) for over 85% original shine, while its quality—assessed by evenness and intensity—can elevate a coin's grade by several points.

M

In numismatics, terms beginning with "M" often relate to coin production processes, grading standards, ceremonial issues, and production anomalies, reflecting both historical techniques and modern minting advancements, such as . Master die. The master die is the original engraved die containing the full design, hardened to a Rockwell scale of 62 or greater for durability, from which working hubs are created to impress multiple working dies used in coin pressing. This steel tool ensures consistency across production runs but is not used directly for striking coins. Maundy money. Maundy money consists of special British silver coins in denominations of 1, 2, 3, and 4 pence, struck annually by the Royal Mint for ceremonial distribution by the reigning monarch on to select pensioners, symbolizing the washing of the disciples' feet; sets are presented in flat leather or plastic cases containing one of each denomination. The tradition dates to the 13th century, with modern issues using and limited to the number of the monarch's age. Medal alignment. Medal alignment, also known as medal turn, refers to the orientation where the designs face the same direction when the coin or is rotated 180 degrees horizontally, contrasting with coin alignment (coin turn) where the reverse is upside down relative to the obverse; this format is standard for but rare on circulating . Medal-coin. A medal-coin is a numismatic item produced as but primarily intended for collection rather than circulation, often classified under non-circulating legal tender (NCLT) items, blending the artistic elements of with nominal monetary value. Milled coinage. Milled coinage denotes coins produced by machine striking, introduced in in the 1560s by Eloye Mestrelle using a screw press to create uniform blanks and impressions, replacing the irregular and reducing clipping; by the late , it became standard in major mints worldwide for precision and security. Milled edge. The milled edge, or reeded edge, features parallel grooves along a coin's rim to deter filing or clipping of ; for example, the U.S. dime has 118 reeds, while quarters have 119, a design element persisting on modern clad coins for tactile identification and anti-counterfeiting. Mint. A mint is a government-operated facility for manufacturing coins, such as the U.S. Mint's location (established 1792, no on its products), for example, in 2024 produced 5.61 billion circulating coins across its network, incorporating advanced technologies like laser etching alongside traditional coining presses. Other branches include ("D" mark) and ("S" mark for special issues). Mint error. A mint error is an intentional or unintentional flaw in coin production due to mechanical or human issues during minting, such as die cracks or improper preparation; these official anomalies command premium market values, with major errors like broadstrikes fetching thousands of dollars depending on rarity and condition. Mint luster. Mint luster describes the original, brilliant surface reflection on uncirculated coins, often exhibiting a cartwheel effect where light spins across the fields like spokes on a , originating from the microscopic flow lines created during striking; this luster diminishes with handling, contact, or environmental exposure. Mint mark. The mint mark is a small letter or symbol on a indicating the producing branch mint, such as "D" for on U.S. coins since 1909 or "P" for on certain modern issues; placement varies by denomination and era, typically near the date or designer's initial, aiding collectors in identifying origin and scarcity. Mint roll. A mint roll is the original paper-wrapped tube containing a standard number of uncirculated coins from the mint, typically 50 for U.S. cents, nickels, and dimes; end rolls, revealing visible coins at the ends, often carry a slight premium in the due to easier condition assessment. Mint set. A mint set is an official annual collection of uncirculated coins from all U.S. Mints for a given year, packaged by the U.S. Mint in plastic holders, differing from proof sets which feature specially struck, high-relief coins on polished planchets for enhanced detail and mirror-like fields. Mint State (MS). Mint State (MS) grading applies to uncirculated coins showing no wear from circulation, scaled numerically from MS-60 (unattractive with heavy marks and impaired luster) to MS-70 (perfect with full strike, original luster, and no visible imperfections at 5x magnification); descriptors like "" (MS-63 to MS-65, attractive with moderate marks) or "gem" (MS-67+, superior quality) refine the assessment. Mis-strike. A mis-strike occurs when a is struck improperly, such as off-center (e.g., 5-50% off, with higher offsets rarer and more valuable) or as a partial strike missing full design details due to misalignment or collar failure; these errors preserve mint luster but exhibit incomplete or shifted imagery. Monster box. A monster box is a large plastic container holding 500 U.S. Silver Eagle coins, equivalent to 500 ounces of silver, distributed through authorized purchasers for secure bulk storage and transport in the . Motto. A motto is an inscribed slogan on coins conveying national or ideological sentiments, such as the U.S. phrase "IN GOD WE TRUST," first mandated on most federal coins in 1908 but made the official national motto in 1956 amid Cold War contexts, appearing on all circulating U.S. coins thereafter. Mule. A mule is a coin struck from mismatched dies, pairing an obverse and reverse not intended for the same issue, resulting in a rare error; a notable example is the 2000-P Sacagawea dollar mule with the Washington quarter obverse, of which about 20 specimens are known, valued up to $250,000 in high grades due to its production anomaly at the Philadelphia Mint.

N

Non-circulating legal tender (NCLT) refers to coins issued by a sovereign government that carry nominal face value and legal tender status but are not intended for everyday circulation or general commerce. These coins are primarily produced for collectors, investors, or as commemoratives, often sold at a premium well above their stated denomination to reflect their intrinsic metal content or artistic value. Unlike circulating coins, NCLT items are typically struck in precious metals such as gold or silver and feature high-quality designs that emphasize numismatic appeal over practical use. The term NCLT distinguishes them from standard currency, highlighting their role in the collector market where they function more as investment vehicles than transactional media. A prominent example of an NCLT coin is the Canadian Maple Leaf series, introduced by the Royal Canadian Mint in 1979 as the world's first with .9999 fine purity. These coins, available in , silver, , and variants, bear face values but are marketed globally for their content rather than circulation, with production volumes exceeding millions annually to meet investor demand. The Maple Leaf's iconic design, featuring the sugar emblem, underscores its status as a non-circulating item, as it is not released into general economic channels and instead serves as a against or a collectible asset. Other nations, including the with the (introduced in 1986), follow similar NCLT models, where designation provides official backing without implying everyday usability. Notgeld, translating from German as "emergency money" or "necessity money," denotes locally issued currency created by municipalities, businesses, or institutions during periods of economic distress to address shortages of official coinage or . Originating in and , Notgeld proliferated during (1914–1918) when wartime hoarding and metal rationing depleted small-denomination coins, prompting over 15,000 varieties from towns and cities to facilitate local trade. These issues were typically low-value notes or tokens, often limited to a fixed circulation period (e.g., six months) and redeemable only within the issuing locality, reflecting the decentralized response to national currency constraints. By the early 1920s, amid the Weimar Republic's crisis peaking in 1923, Notgeld evolved into higher-denomination forms, with billions printed as the depreciated dramatically, serving both practical and speculative purposes before the stabilization in late 1923. Notgeld was produced in diverse materials beyond traditional paper, including cardboard, wood, linen, and even metal for coin-like tokens, allowing issuers to improvise amid resource scarcity. Designs varied widely to incorporate local pride and : examples often featured patriotic motifs, military scenes, or subversive commentary on food shortages (e.g., "Turnip Notgeld" referencing the 1917 famine), while 1920s issues showcased regional landmarks, , or humorous vignettes to boost morale and collectibility. Although most Notgeld ceased after 1923, limited issues reemerged during (1939–1945) in occupied territories or under wartime controls, such as in annexed regions where official was insufficient, though on a far smaller scale than the earlier periods. Today, Notgeld remains a staple of numismatic collections, valued for its historical insight into crisis economics rather than intrinsic worth.

O

Obverse
The obverse is the principal side of a , often referred to as the "heads" side, which typically features a , , or main device. In coinage, the obverse commonly displays the profile of a president or symbolic figure, such as , distinguishing it from the reverse, which shows secondary motifs like eagles or buildings. This convention aligns with broader numismatic practice where the obverse holds the primary identifying elements, though exact designs vary; for instance, in Canadian coins, the obverse bears the of the reigning British as . The designation promotes standardization in cataloging and handling, ensuring collectors and institutions recognize the coin's front face consistently across series. Oroide
Oroide is a brass-like alloy composed primarily of , , tin, and sometimes lead, engineered to mimic the color and luster of , making it popular for inexpensive imitations in the . In , it was frequently used to produce fake or low-cost medals and coin-like tokens that deceived casual observers into believing they were genuine pieces, often struck during periods of high demand for affordable jewelry and souvenirs. Typically composed of approximately 85% and 15% or tin, yielding a bright hue suitable for or direct minting. Collectors must scrutinize such items for authenticity, as oroide's softer composition leads to quicker wear and distinctive patination compared to true alloys. Overdate
An overdate is a die variety where a new digit is punched over an existing one on the working die, resulting in a that displays two partially visible dates superimposed, usually from reusing a prior year's hub to save production time. This error occurs when mint workers engrave the current year directly onto a die already bearing the previous year's date, creating a layered effect visible under magnification, such as the "2" partially obscuring the "1" in the 1942/1 Mercury dime struck at the Philadelphia Mint. The 1942/1 variety, with a mintage integrated into the 51.5 million total Philadelphia dimes of 1942, remains a sought-after key date due to its bold underdigit and historical wartime context. Overdates enhance a coin's collectible value by introducing rarity within standard issues, though subtle examples require expert verification to distinguish from die wear or damage. Overgraded
Overgraded refers to a that has been assigned a condition grade higher than its actual state warrants, often due to subjective interpretation or market pressures in uncertified sales. This issue is prevalent with raw coins, where sellers may describe a piece as Mint State to inflate its appeal, leading buyers to overpay before third-party reveals the true grade, such as a claimed MS-65 actually meriting MS-62. Professional grading services like NGC address overgrading through guarantees allowing review if a is deemed inaccurately assessed, protecting against premiums on misrepresented condition. In the broader market, overgraded coins undermine trust, prompting collectors to prioritize slabbed examples from reputable firms to ensure accurate valuation based on wear, luster, and strike quality. Overstrike
An overstrike occurs when a pre-existing , rather than a blank , is struck with new dies, imprinting a fresh over the original while traces of the host coin may remain visible. This technique was employed deliberately in early American minting to repurpose foreign silver, such as overstriking Spanish colonial 8 reales with motifs during the late 18th and early 19th centuries when domestic blanks were scarce. Examples include U.S. half dollars countermarked on Spanish pillars or bust-type reales, blending European colonial hosts with American liberty to facilitate circulation in trade-heavy regions. Overstrikes can also arise accidentally from mint errors, but intentional ones like these reflect economic , adding historical layers that boost numismatic interest despite potential offsets in the underlying features.

P

Pattern
A is an experimental or trial struck to test a proposed new design, composition, size, or minting process before regular production begins. These pieces are typically produced in limited quantities using official dies but often in different metals or finishes from the intended circulating . For example, the 1879 U.S. silver patterns were created to evaluate various designs for the replacement, including the Flowing Hair and Stella varieties struck in silver, gold, or aluminum. Patina
Patina refers to the natural oxidation layer that forms on the surface of coins, particularly those made of , , or silver, as a result of exposure to air, moisture, and environmental elements over time. On coins, this often appears as a or encrustation, while on silver it can manifest as toning in shades of , , or iridescent hues; desirable patinas are even and colorful, enhancing eye appeal, whereas uneven or pitted diminishes value. For instance, ancient Roman coins frequently develop a stable patina from and carbonate formation, which numismatists preserve to maintain authenticity and aesthetic integrity rather than cleaning it off. Pedigree
Pedigree denotes the documented history of ownership for a coin, tracing its provenance through notable collections, auctions, or exhibitions, which can significantly influence its market value and authenticity verification. This chain of custody often includes references to famous collectors or sales catalogs, providing context on the coin's journey and helping to confirm rarity or condition. A prominent example is coins from the Garrett Collection, amassed by brothers John and T. Harrison Garrett in the 19th century and later dispersed via Johns Hopkins University auctions in the 1980s, where pedigree details from Stack's sales boosted premiums for items like rare U.S. gold coins. Piedfort
A is a struck on a approximately twice the normal thickness and weight, using standard dies, resulting in a heavier piece with the same diameter as its circulating counterpart. Originating in medieval as presentation or ceremonial items—literally meaning "heavy foot" in French—these were often given as diplomatic gifts rather than circulated. Modern examples include the 1982 Belgian 10-franc , produced in silver to commemorate King Baudouin's silver wedding anniversary, valued for their collectible appeal despite not being . Planchet
The is the blank metal disk, prepared from rolled and cut to precise specifications, that serves as the base material before being struck by dies to imprint a coin's . It typically features an upset rim—a raised edge formed during preparation—to protect the coin's borders from wear during circulation. Common defects include laminations (peeling surface layers from impurities) or clips (irregular edges from cutting errors), which can affect grading; for example, early U.S. planchets for half cents were hand-cut from sheets, sometimes showing irregular shapes. Pocket piece
A pocket piece is a coin carried in one's pocket or clothing for superstitious reasons, such as good luck, protection, or as a , often becoming worn from frequent handling. These are typically inexpensive, circulated examples chosen for personal significance rather than numismatic value. An illustrative case is the worn Indian Head penny, a common 19th-century U.S. one-cent frequently selected as a pocket piece due to its availability and symbolic association with prosperity during the . Portrait
In numismatics, the portrait refers to the engraved or sculpted of a , , or allegorical figure on a coin's obverse side, capturing stylistic details like facial features, hair, and attire that evolve with artistic trends and . Alignment and orientation—such as "upright" or "medallic"—affect collectibility, with high-relief portraits prized for depth and contrast. Historical progression is evident in U.S. coinage, from the classical Liberty Head on 19th-century dimes to the realistic on the 1932 quarter, reflecting shifts from to influenced by engravers like Charles Barber and John Flanagan. Post-mint damage
Post-mint damage encompasses any physical alterations or impairments to a occurring after it leaves the mint, such as scratches, dents, bends, , or environmental , distinguishing it from production errors. Unlike mint-made varieties, this damage typically reduces grade and value, though minor marks may be overlooked in circulated coins. For example, a circulated with graffiti or heavy bag marks from bank handling exemplifies post-mint damage, as opposed to die cracks formed during striking. Privy mark
A privy mark is a small, discreet , letter, or incorporated into a coin's field or edge by the mint to indicate a specific variety, commemorative theme, or mintmaster's , often subtle to avoid altering the main . These marks facilitate attribution and of limited editions without compromising . Notable instances include the star-shaped privy marks on Berlin Mint 5-mark coins from the era (1873–1918), used to denote particular issues or engravers like . Proclamation coins
Proclamation coins are foreign or colonial coins officially declared by a through legislative to address currency shortages, often retaining their original designs and denominations. This practice allowed immediate usability without new minting. In the early U.S., the 1793 by President Washington and Secretary Hamilton designated Spanish silver dollars as at , enabling their widespread circulation alongside emerging American coinage until domestic production ramped up. Proof
A proof coin is a specially minted specimen produced for collectors using highly polished planchets and dies, often struck multiple times under controlled conditions to achieve sharp details, mirrored fields, and frosted devices, resulting in superior quality over circulation strikes. The cameo effect—high contrast between raised and background elements—arises from selective frosting techniques. For instance, modern U.S. proofs exhibit brilliant mirror-like surfaces with devices in satin finish, as seen in annual sets from the or Mints. Proof set
A proof set is a complete annual collection of proof coins from a mint, encompassing all denominations issued that year, packaged in a protective case or holder for preservation and display. Finishes vary, with early sets featuring brilliant proof and later ones incorporating or reverse proof contrasts. The U.S. Mint's 1936 proof set, limited to 3,837 examples with the quarter as the key low-mintage , marked the revival of proof production after a hiatus, highly sought by collectors for its historical significance. Punch mark
Punch marks are incuse impressions or symbols hammered into metal blanks or bars before full coinage, used in ancient economies to indicate value, authority, or ownership, often as a precursor to die-struck coins. These rudimentary stamps facilitated trade in pre-minted forms. In the Indus Valley Civilization around 2500 BCE, silver bore symbols like suns and animals, representing early standardized in without unified designs.

Terms Q–Z

Q

In numismatics, the term quarter denotes a coin with a of 25 cents, a standard denomination in the United States since the late . The modern iteration, known as the , was introduced in 1932 to commemorate the 200th anniversary of George Washington's birth, featuring his portrait on the obverse designed by John Flanagan. From 1932 to 1964, these quarters were composed of 90% silver and 10% , weighing 6.25 grams with a diameter of 24.3 millimeters. Beginning in 1965, due to rising silver prices, the composition shifted to copper-nickel clad over a pure core, reducing the weight to 5.67 grams while maintaining the same dimensions; this clad version has been standard for all Washington quarters produced to the present day. The reverse initially depicted an eagle with arrows and olive branches until 1998, after which various commemorative programs, such as the (1999–2008) and the current American Women Quarters (2022–2025), have featured rotating designs. The refers to a $2.50 coin authorized by the and minted by the from 1796 to 1929, serving as a smaller denomination in early American coinage alongside the ($5) and eagle ($10). Each quarter eagle contains 0.1209 ounces of pure (90% ), with a total weight of 4.18 grams and a of 18 millimeters, making it a compact yet valuable piece for circulation and in its era. Production spanned multiple designs across , Charlotte, Dahlonega, New Orleans, and mints, with over 14 million pieces struck overall, though many were melted during gold recalls and economic shifts. A prominent early design for the quarter eagle is the Capped Bust, first introduced in 1796 without stars on the obverse and refined in subsequent years to include 13 or 16 stars encircling 's bust. Engraved by John Reich, the assistant to Chief Engraver Robert Scot, the Capped Bust to the Right variant (1796–1807) portrays Liberty wearing a liberty cap and flowing hair, with "LIBERTY" above and the date below, while the reverse shows a heraldic eagle clutching arrows and an . Later iterations, such as the Capped Bust to the Left (1821–1827 and 1829–1834), adapted this motif with modifications for improved striking, but mintage remained low, often under 5,000 pieces annually, contributing to their rarity today.

R

Raw
A raw coin refers to an ungraded and uncertified numismatic item that has not been encapsulated in a holder by a service. Trading raw coins carries higher risks compared to certified examples, primarily due to uncertainties in , condition assessment, and potential for counterfeits or discrepancies in grading, as grading remains a subjective process. Reeded edge
The reeded edge is a grooved or lined feature on the perimeter of a , consisting of raised vertical protrusions designed historically to deter clipping and shaving of by making alterations more detectable. Introduced on machine-struck coins in the 18th and 19th centuries, this security measure replaced earlier lettered edges on U.S. coinage, as seen in the transition for Half Dollars in 1836. The number of reeds varies by denomination and era; for instance, circulation strike Morgan Dollars typically feature 189 reeds, while some 1921 varieties have 157. Relief
Relief in numismatics denotes the vertical height of a coin's design elements, or devices, above the surrounding flat field, which affects strike quality, stacking, and visual appeal. Ancient Roman and Greek coins often exhibited high relief due to early striking techniques, allowing for detailed portraits and motifs that stood prominently, sometimes exceeding modern standards for depth. In contrast, modern coins, such as the 1907 High Relief Saint-Gaudens Double Eagle, initially featured elevated relief for artistic effect but were later reduced to lower levels to facilitate coining, improve die life, and enable better stacking in commerce, as high relief required multiple strikes and caused production challenges. Re-strike
A re-strike is a produced at a later date using original or surviving dies from an earlier issue, often for collectors or to meet demand beyond the initial mintage. These differ from originals in subtle diagnostic traits like die wear or alloy composition. A notable example is the re-strikes of the 1879 Flowing Hair Stella ($4 gold ), struck using the same dies after the initial experimental production to fulfill congressional authorizations. Repunched date
A repunched date occurs when a die maker punches a date numeral into the die but repositions or deepens it due to an initial misalignment or insufficient impression, resulting in doubled or shadowed digits visible on the struck coin. This die variety is common in early hand-punched dies before mechanized processes became standard. An example is the 1983-D Washington Quarter with a repunched "D" mintmark appearing as "D over D," where the initial punch was corrected, creating a diagnostic doubling sought by variety collectors. Reverse
The reverse, often called the "tails" side, is the secondary face of a coin, typically bearing the denomination, national symbols, or emblems like eagles or shields, in contrast to the obverse's or principal . Orientation standards distinguish "coin turn," where the reverse aligns upright when the obverse is rotated 180 degrees horizontally, from "medal turn," a vertical flip more common in commemorative or ancient issues; U.S. circulating coins generally follow coin turn. Reverse proof
A reverse proof coin features a frosted background with mirrored, highly polished devices, inverting the traditional proof finish where fields are mirrored and designs frosted, to create striking contrast for collectors. This modern innovation, popularized in the 21st century, enhances visual depth and is produced using specially prepared planchets and dies struck multiple times. Examples include the U.S. Mint's American Innovation $1 Coin Reverse Proof Sets from 2022 onward, where the reverse designs highlight state innovations against the frosted fields. Rim
The rim is the raised, continuous border encircling the of a , formed during the upsetting to protect the central devices from and facilitate stacking. Denting or marks on the rim often result from post-mint contact, such as bag marks where coins rub against each other or hard surfaces, appearing as small nicks that do not affect the grade as severely as central damage.

S

Sacagawea dollar
The , also known as the golden dollar, is a one-dollar coin issued by the from 2000 to 2008 for general circulation, featuring a manganese-brass composition that provides a golden color and weighs 8.1 grams. The obverse depicts , the guide from the , with her infant son, while the reverse from 2000 to 2008 shows an eagle in flight designed by Thomas D. Rogers. Production ceased for circulation after 2008, though special issues continued annually under the Native American $1 Coin Act to highlight Native American contributions. Notable errors include the rare 2000-P "" variety and mules struck with quarter reverses, which have drawn collector interest due to their scarcity. Scratch
In numismatics, a scratch refers to a linear mark or gouge on a 's surface resulting from post-mint damage, such as contact with another object after production, which can impair the coin's eye appeal and reduce its grade. Scratches differ from hairlines, which are finer, shallower lines often caused by , , or light handling, and are considered less severe but still indicative of surface alteration. The severity of a scratch affects valuation; minor ones may allow high grades like MS-65, while deeper ones can drop a coin to VF or lower, depending on location and visibility. Seigniorage
in denotes the profit a earns from minting , calculated as the difference between the coin's and its production cost, providing revenue without taxation. For instance, producing a $1 costing 10 cents yields 90 cents in , though this can turn negative if material costs exceed , as with the U.S. after 2006 when and prices rose above one cent. This economic concept influences minting decisions, balancing revenue against circulation needs, and has been a key factor in debates over low-denomination viability. Series
A coin series in numismatics comprises a group of coins sharing the same design, denomination, and minting period, often produced across multiple years and mints to facilitate by type or date. The series, minted from 1916 to 1930, exemplifies this, featuring Hermon A. MacNeil's design of holding a shield and on the obverse and an eagle on the reverse, with variations like the 1916 Type 1 and later Type 2 revisions for modesty and relief. Series organization aids collectors in building sets, emphasizing continuity in artistic and historical themes over isolated issues. Silver
Silver (Ag), a precious metal with atomic number 47, has been a cornerstone of numismatic coinage due to its durability, luster, and historical value, often alloyed for hardness while maintaining high fineness. In U.S. coinage, silver's standard fineness was .900 (90% pure) until 1965, containing 0.77344 troy ounces per dollar in coins like the Morgan dollar, struck from 1878 to 1904 and 1921 at multiple mints. Morgan dollars are prized for their strike quality, with strong details in Liberty's hair and the eagle's feathers reflecting careful die preparation, though later issues sometimes show weaker strikes due to worn dies. Modern bullion coins, such as the American Silver Eagle, achieve .999 fineness for investment appeal. Slab
A slab in numismatics is a tamper-evident holder used by services to encapsulate authenticated and graded coins, protecting them from further damage while displaying certification details like grade and variety. Introduced by the Professional Coin Grading Service (PCGS) in 1986, slabbing standardized the market by providing impartial assessments, with major firms like PCGS and Numismatic Guaranty Company (NGC) dominating the "slabbed" coin trade. Slabbed coins command premiums in auctions due to verified condition, often graded on a 1-70 scale where MS-70 denotes perfection, fostering liquidity in the collector market. Specimen strike
A specimen strike refers to a high-quality produced with special care during regular minting operations, featuring a satin-like finish and sharp details that surpass standard business strikes but fall short of proofs, often using polished planchets and dies. This term, particularly associated with British numismatics, describes coins struck for presentation or official sets before modern proofing techniques, such as early 19th-century U.S. issues from 1792 to 1816 that exhibit proof-like surfaces. Specimen strikes are identifiable by their reflective fields and frosted devices, commanding higher values among collectors for their superior aesthetics and rarity in documented sets.

Token

In numismatics, a token refers to a privately issued, coin-like object used as an unofficial , often for small change or specific transactions, lacking the status of . These items fall under the category of and were commonly produced during periods of currency shortages to facilitate commerce. A prominent example is the Civil War store card, an advertising token minted privately between 1862 and 1864 in the United States, featuring merchant names and addresses on one side and patriotic or political motifs on the other, circulated primarily in the Northeast due to the scarcity of federal small-denomination coins. Tokens like Civil War store cards were typically composed of copper to differentiate them from official silver or gold coinage, adhering to practical limits that avoided precious metals and reduced counterfeiting risks, though federal legislation in April 1864 eventually prohibited their issuance as currency substitutes. Similar variants, such as German from the early 20th century, served emergency small-change functions during economic instability.

Trade dollar

The trade dollar is a specialized minted by the from 1873 to 1885 specifically for and international trade, aimed at competing with foreign silver dollars like the Mexican peso in Asian markets, particularly . Authorized under the , it was not intended for domestic circulation but entered U.S. commerce due to silver price fluctuations, leading to its demonetization for trade purposes in 1876 while production continued until 1885. Weighing 420 grains (27.22 grams) with a composition of 90% silver and 10% —slightly heavier than the standard U.S. silver dollar's 412.5 grains—the measured 38.1 mm in diameter and featured designs by William Barber, including Liberty seated on the obverse and an eagle with trade symbols on the reverse. Over 35 million were struck across , Carson City, New Orleans, and mints, with many bearing chop marks from Asian merchants verifying silver content.

Type coin

In numismatics, a type coin is an exemplar representing a distinct variation in a coin series, characterized by shared elements such as motifs, metallic composition, denomination, , or edge type, rather than specific dates or mint marks. This concept forms the foundation of type collecting, where enthusiasts assemble sets featuring one representative of each major design evolution, emphasizing artistic and historical progression over chronological completeness. For instance, in U.S. coinage, a type coin might include the Draped Bust design for half dollars (1794–1807) or the Seated Liberty type (1839–1891), serving as a basic unit for set-building without requiring every issuance. The term originates from standard references like the "Red Book," which defines a type as a series unified by distinguishing design and technical attributes, promoting accessibility for collectors focused on variety rather than rarity of dates.

U

In numismatics, an ** refers to a specimen that exhibits no evidence of from circulation, preserving its original condition as struck by the mint. This term is synonymous with Mint State (MS), denoting coins graded from MS-60 to MS-70 based on the absence of or abrasion on the surfaces. Uncirculated coins typically retain their mint luster, the reflective sheen resulting from the microscopic texture of the metal surface, which can appear as a flowing, cartwheel effect when the coin is tilted under light. While ideally pristine, many uncirculated coins bear minor bag marks—small nicks or scuffs incurred from contact with other coins during mint processing and storage in cloth bags—without compromising their overall unworn status. Undergrade describes the assignment of a condition grade to a that is lower than its actual quality merits, often due to conservative evaluation or oversight in assessing surface preservation, strike quality, or luster. This contrasts with overgrade, where a coin receives an inflated assessment, potentially misleading collectors on value. Undergading can occur in professional grading or dealer pricing, particularly with challenging series like early copper coins, but it allows undervalued pieces to be acquired at a bargain relative to their true potential.

V

In numismatics, a variety refers to a that differs from the standard or basic design type of its issue in a distinctive manner, often resulting from unique characteristics in the dies used to strike it. These differences can include variations in lettering, date positioning, or design elements, such as doubled or tripled features caused by errors. Varieties are distinguished from mint errors, as the former are typically intentional or repeatable aspects of the production process, while the latter are accidental and non-reproducible. For instance, within early cent series, varieties encompass subtle shifts like the placement of stars or berries on Liberty Seated designs, which collectors catalog separately for their diagnostic appeal. Collectors pursue varieties to assemble complete sets, as they add layers of rarity and historical interest to a type. Die varieties, such as those documented in the Cherrypickers' Guide, further refine this by identifying specific hubbing or polishing marks on individual dies, like the 1955 Doubled Die Obverse Lincoln Cent. These attributes can significantly elevate a coin's desirability, with major varieties like the 1917 Doubled Die Obverse Standing Liberty Quarter commanding premiums over standard issues due to their scarcity and visual impact. The value of a numismatic item, distinct from its intrinsic metal content, is determined by a interplay of factors including rarity, condition (or grade), and market . Rarity encompasses both absolute —such as low mintage figures or survival rates—and relative population in high grades, often tracked via certification services' population reports. Condition plays a pivotal role, with coins graded on the Sheldon Scale (1-70) seeing exponential value increases in Mint State (MS-60 to MS-70), where even a one-point grade jump can multiply worth by factors of 5 to 10 or more for desirable issues. is driven by collector preferences, economic trends, and cultural significance, amplifying values for coins tied to historical events or popular series like Lincoln Cents. Auction records provide empirical benchmarks for numismatic value, reflecting real-market transactions under competitive . For example, a high-grade example of the iconic 1955 Doubled Die Obverse Lincoln Cent, graded MS-65+ Red by PCGS, realized $114,000 at a in 2018, underscoring how variety-specific rarity and pristine preservation can drive prices far beyond common counterparts. Similarly, rare varieties like the 1942/1 Overdate in MS-67 Full Bands condition have fetched over $100,000 in recent sales, illustrating the premium for documented pedigrees and eye appeal. These records, compiled from major houses like and Stack's Bowers, serve as guides but fluctuate with market cycles, emphasizing the need for current appraisal.

W

In numismatics, a weak strike refers to a that exhibits incomplete or flat details in its due to insufficient pressure applied during the minting process or misalignment of the dies. This striking flaw results in areas where the metal flow from the fails to fully capture the intended motifs, often appearing as softened or absent features on high points of the . Weak strikes are particularly prevalent in high-relief designs, where the elevated elements require greater force to fill properly, as seen in the 1921 , which was produced with high relief and frequently shows central weakness in Liberty's hair and the eagle's feathers. To mitigate such issues, subsequent Peace dollars from 1922 onward adopted a lower-relief to more consistent and complete strikes. The war nickel, officially the Jefferson nickel series produced by the United States Mint from 1942 to 1945, represents a temporary alloy modification driven by World War II resource demands. These coins shifted from the standard 75% copper and 25% nickel composition to 56% copper, 35% silver, and 9% manganese to conserve nickel for military applications, such as armor plating. The silver content imparted a distinct whitish tone compared to the darker regular nickels, and to facilitate easy identification for postwar silver reclamation, the Mint applied oversized mint marks—positioned prominently above the Monticello dome on the reverse—using larger lettering than on prewar issues. This alloy change affected all three operating mints (Philadelphia, Denver, and San Francisco), with production spanning 1942 through 1945, after which the original composition resumed in 1946.

Y

In , a year set refers to a collection of coins minted in a specific , typically including one example of each major denomination issued by a country's mints during that period, without necessarily focusing on mint marks or varieties. This approach emphasizes the diversity of circulating currency for that year, often appealing to collectors interested in economic or historical contexts of the era, such as transitions in metal composition or design changes. Unlike mint sets, which are pre-packaged products distributed by the issuing authority containing uncirculated coins from multiple mints, year sets are usually assembled by individual collectors from circulation or secondary markets. For instance, a 1964 year set commonly includes the Lincoln Memorial cent, , , , and , notable as the final year for 90% silver content in the dime, quarter, and denominations before the shift to clad compositions. Such sets provide insight into the numismatic landscape at a pivotal moment, reflecting post-World War II economic stability and the introduction of the following the president's . Collectors may pursue year sets in various grades, from circulated examples to high-quality uncirculated pieces, to capture the broad usability of coins in everyday transactions during that time.

Z

In numismatics, a coin typically denotes a coin with a core primarily composed of , often plated with another metal for durability and appearance, as seen in modern circulating currencies designed to reduce production costs amid rising metal prices. The most prominent example is the post-1982 one-cent , or Lincoln penny, which has an overall composition of 97.5% and 2.5% , consisting of a core that is 99.2% and 0.8% electroplated with a thin layer of pure , weighing 2.5 grams. This composition change, implemented by the U.S. Mint in mid-1982 due to escalating costs, marked a shift from the pre-1982 solid -zinc (95% , 5% tin or ), allowing continued production of the low-denomination without economic strain. The core provides a lightweight, inexpensive base, but the must remain intact to prevent exposure, as 's reactivity makes it prone to rapid oxidation in environmental conditions. Corrosion issues, commonly termed "zinc rot" or "zinc pest," arise when the plating is breached through wear, manufacturing defects, or contaminants trapped between layers, leading to white powdery zinc oxide formation that can cause the coin to delaminate, pit, or disintegrate over time. Studies by the U.S. Mint have highlighted that exposed zinc cores corrode quickly in normal circulation or humid environments, contrasting with the more resistant pre-1982 copper versions, though the plating generally offers sufficient protection for most use cases. In numismatic preservation, affected zinc coins require careful handling to avoid accelerating degradation, often involving stabilization techniques rather than cleaning.

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  192. https://www.pcgs.com/news/the-freaky-2000-mule-sacagawea-dollar-with-state-quarter-obverse
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  194. https://www.mint.ca/en/faq
  195. https://www.britishmuseum.org/exhibitions/currency-crisis-german-emergency-money-1914-1924
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  202. https://www.pcgs.com/coinfacts/coin/1942-1-10c/5036
  203. https://www.coinworld.com/news/us-coins/us-mint-strikes-dime-overdates-in-1942.html
  204. https://www.coinworld.com/news/us-coins/grading-the-grading-services-.html
  205. https://boards.ngccoin.com/topic/99646-which-is-worse-when-a-grading-service-over-grades-or-under-grades-a-coin/
  206. https://www.ngccoin.com/coin-grading/ngc-guarantee/
  207. https://www.gainesvillecoins.com/blog/decoding-coin-grades-coin-grading-abbreviations
  208. https://www.pcgs.com/glossary
  209. https://www.pcgs.com/auctionprices/item/1824-1c-gw-112-c3-washington-lafayette-1820-bn/694057/7384464777704691564
  210. https://stacksbowers.com/overstrike-8-reales/
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  212. https://edu.rsc.org/feature/ancient-coins/2020090.article
  213. https://www.ngccoin.com/glossary/
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  216. https://stacksbowers.com/coin-resource-center/us-coins/gold-quarter-eagles/capped-bust-quarter-eagle-right
  217. https://www.ngccoin.com/coin-explorer/united-states/gold-quarter-eagles/liberty-head-2.50-1840-1907/17720/1840-o-2.5-ms/
  218. https://cappedbustquartereagle.com/
  219. https://www.pcgs.com/coinfacts/category/capped-bust-2-5-1808-1834/52
  220. https://www.ngccoin.com/news/article/13348/
  221. https://boards.ngccoin.com/topic/11892-raw-vs-slabbed/
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  228. https://www.ngccoin.com/news/article/4987/gobrecht-dollar/
  229. https://www.ngccoin.com/news/article/7639/learn-grading-proof-types/
  230. https://www.usmint.gov/news/press-releases/united-states-mint-releases-2022-american-innovation-dollar-reverse-proof-set-on-november-14
  231. https://www.pcgs.com/news/examining-contact-marks-on-coins
  232. https://www.usmint.gov/25th-anniversary-sacagawea-2025-golden-dollar-24k-one-half-ounce-gold-proof-coin-25SG1.html
  233. https://app.homeschoolhistory.com/resource/1714166815192x330149862715141570
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  236. https://www.numismaticnews.net/archive/scratches-vary-in-severity-on-coins
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  245. https://www.herobullion.com/what-is-a-coin-slab/
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