Abrasions - Scuffs, slide marks, or other marks on a coin made by moving contact between the coin and another coin or the coin and a hard surface or object.
Acetone - A highly volatile solvent used to remove grease, dirt, and foreign material from the surface of a coin without chemically altering the metallic structure of a coin.
Adjustment - The filing down of a blank to reduce it to the correct weight before striking, revealed by file marks on the surface.
Alliance Coinage - Coins struck by two or more states in conjunction.
Alloy - combination of two or more metals.
Altered Coin - A coin that has a date, mint mark, or other feature that has been changed, added, or removed, to give the appearance of a more rare or valuable issue.
Ancient - Coins of the world struck around 600 BC to 450 AD
Anepigraphic Coin - Coin with no inscription.
Annealing - The heating of a die or planchet to soften the metal before preparation of the die or striking of the coin.
Annulet - Small circle used as an ornament or spacing device in inscriptions.
Anvil die - The lower die, usually the reverse – although on some issues with striking problems, the obverse was employed as the lower die. Because of the physics of minting, the fixed lower-die impression is slightly better struck than the upper-die impression.
Arrows - Design element usually found in the left (viewer's right) claw of the eagle seen on many United States coins. After 1807, there usually were three arrows while prior to that time the bundle consisted of numerous ones.
Arrows and rays - Term referring to the quarters and half dollars of 1853. The rays were removed in 1854 because of striking difficulties presented by the busy design.
Arrows at date - Term referring to the arrows to the left and right of the date, added to the dies to indicate a weight increase or decrease.
Artificial toning - Coloring added to the surface of a coin by chemicals and/or heat. Many different methods have been employed over the years.
Aesthetic appeal - The artistic appeal which a coin has for the viewer. The desirability of a coin as evidenced by a combination of toning or luster, pleasing surface coloration, attractive planchet and other artistic consideration. The asthetic appeal of a voin will vary from viewer to viewer.
Assay - Test to determine the fineness of precious metals.
Attributes - the elements of a coin that help determine grade (such as strike, marks, luster, and appeal)
Bag mark - a small surface mark or nick on a coin that occurs from contact with other coins while in holders or bags
Base Metal - A non precious metal. For example copper or bronze. All the current coins circulating in most countries (Including Great Britain) are made by alloying 2 or more base metals.
Beading - a form of design around the edge of a coin, once served a functional purpose to deter clipping or shaving of the metal
Billion - a low grade alloy of silver (usually less than 50%) mixed with another alloy such as copper.
Blank - flat piece of metal on which a coin’s image is struck (see planchet)
Bourse - Area in a coin exhibition where dealers sell their wares.
Bracteate - Coin struck on such a thin planchet that the image impressed on one side shows through on the other.
Brilliant Uncirculated - coin grade with no signs of wear, it must also have never been circulated (also considered "mint state" or "uncirculated")
Bullion - gold or silver coins, bars or ingots
Burnishing - a process by which a planchet or coin are made to shine through rubbing or polishing
Business strike - a coin produced for general use and circulation (not proof).
CAM - Short for "Cameo," proof coins that have frosted devices and lettering that contrast with the shinier fields
Carbon spot - a brown or black spot on a coin, caused by impurities or oxidation
Cartwheel - a visual effect where the coin’s luster appears to spin in a radiating fashion. Considered desirable.
Cast coins - coins that are made by pouring molten metal into a mold.
Cherry picker - a collector who finds scarce and unusual coins by searching dealers old stock of coins
Chop Mark - a mark stamped into coins by Oriental merchants as a means of verifying the silver content
Circulated - coins with wear that have been handled, in any condition
Clad coin - coins are made by compositing layers of metal together.
Cleaned - coins cleaned to enhance their appearance through chemical dipping, light brushing, polishing or any combination of the three methods. Cleaning is considered to be undesirable by most collectors since the coin has been altered and not in its original state.
Cob - Irregular shaped silver piece sliced from a bar of silver and crudely stamped for use in Spanish America during the 16th to 18th centuries.
Collar - the outer ring or die chamber that hold a blank in place in the coinage press during coin striking.
Commemorative - a coin or medal minted to honor an outstanding person, place, or event.
Condition - state or quality of a coin
Conjoined portrait - Obverse portrait with two heads or busts in profile facing the same direction and overlapping. Also known as accolated or jugate.
Corrosion - some metals corrode due to oxidation, handling, or exposure to chemicals or moisture.
Counterfeit - fake coins or currency that appear legitimate
Crack-out - a coin removed from a third party grading holder
Crown Size Coin - Any world coin ranging in size from 36 mm to 42mm. The term "Crown" is in reference to the large coins issued by Great Britain that carried the denomination of One Crown. Popular collecting method of World Coin Collectors and in particular coins made of silver are the most sought after.
Cupellation - Refining process used to separate gold and silver from lead and other impurities in a bone ash pot called a cupel; used in assaying to determine fineness.
Cupro-Nickel - Term used to describe the alloy of copper and nickel.
Currency - any kind of money that is legal tender
Date Set - a coin set for a specific coin series where a representative of each year is acquired without regard to specific mint marks or varieties
Debasement - Reduction of a coin's precious metal content.
Demonetization - Withdrawal of coins from circulation, declaring them to be worthless.
Denomination - the monetary value assigned by the issuing government to a coin.
Dentils - the tooth-like devices around the rim of many coins
Device - a design element on a coin such as an eagle or building or star for example.
Die - an engraved hardened steel stamp used for minting a design on a blank piece of metal (planchet) to make a coin
Die Axis - The angle at which the top and bottom coin dies oppose each other when the coin is struck. In other words you can hold a coin by the top and bottom, turn it around and the other side is up or down thus giving you two standard die axis combinations; ^^ and ^v . Axis errors are now measured by the angle of degrees when a die is not correctly aligned to one of the two standards. During ancient times coins often had random die rotation depending on how the dies were placed before striking. - Die break - die defect, usually a crack or break, usually visible on the resulting coin as a raised line. (also referred to as a die crack
Die Chip - small chip of metal that breaks away from the surface of a die, creating a void that coinage metal flows into during striking. Usually seen as a small raised lump on a coin.
Die Polishing - Overzealous polishing of a coin die to remove a small blemish and deep grooves are accidentally made into the surface of the die. These grooves translate to raised metal or lines on a coin.
Die variety - minor alteration to a coin design.
Dipped - coins that are cleaned in a mild acid (or cleansing) solution to remove tarnish and unwanted toning. Cleaning coins is not recommended except by professional conservationists.
Doubled die - a coin that has been struck two times by a die can result in doubled coin design elements. Usually there is an offset or slight misalignment that makes the doubling visible.
Dump - Coin struck on a very thick planchet.
Edge - The edge of a coin may be plain, imprinted with text, reeded or even ornamented.
Effigy - Portrait or bust design.
Engraver - the artist who sculpts the coin design prior to making dies. The master dies are made from the large sized sculpted artwork.
Error coin - a coin that was minted incorrectly and was missed in the mint’s quality control. Few make it into circulation, but when they do they can be valuable.
Evasion - A counterfeit coin, deliberately designed to be close enough to a genuine coin to pass a casual inspection (or to fool somebody illiterate) but with distinctly different legends and inscriptions, such that if a manufacturer of evasions were arrested for counterfeiting, he could plead not guilty, on the grounds that his "souvenir medals" were sufficiently different in design from coinage.
Exergue - portion of a coin beneath the main design typically bearing a date or denomination.
Exonumia - The study of coin like objects or items related to numismatics such as tokens, medals, elongated coins, or wooden nickels. May also be associated with items of notaphily or scripophily such as checks or credit cards.
Fantasy coin - a coin privately minted with no official denomination & currency status but intended to convey the idea of a new design, concept, or political statement.
Field - area on a coin with no design or inscription or device (basically the background)
Filler - a coin in heavily worn condition that may be used temporarily in a collection until a better specimen is located.
Fillet - A term sometimes used to describe a head band on a coin portrait design.
Filled Die Error - foreign grease and/or dirt that becomes trapped within a die during the coining process. Filled-die errors cause elements of a coin’s design to disappear. Some are severe enough to obstruct almost the entire die, while some are localized and obstruct only a small portion of the design.
Flan - flat piece of metal on which a coin’s image is struck (see planchet)
Flip - clear plastic coin holder, be sure to only buy archival quality flips
Frosted devices - raised designs on a coin which are struck with treated dies that have frost in recessed areas
Gem - a generic term used for an excellent coin
Ghosting - The reason a coin will sometimes show a faint sign of one sides design on the other. Ghosting is due to the dies hitting each other without a blank in place.
Globular - Descriptive of a coin struck on a very thick planchet with convex sides.
Grade - coins are graded on a scale to represent the quality and preservation of a coin.
Gresham's Law - 16th century English financier - when two coins with the same face value but different intrinsic values are in circulation at the same time, the one with lesser intrinsic value will remain in circulation while the other is hoarded
Hairline - a thin scratch on a coin typically from improper cleaning, polishing, or damage
Hammered - Descriptive of coins struck by hand, using a hammer to impress the dies.
Haze - a hazy film on the surface of a coin, typically occurs over time due to chemical reactions or exposure
Hub - a piece of die steel showing the coinage devices in relief, the hub is used to produce a die which in turn has incuse devices
Incuse - design element on a coin that has been stamped below the surface of the coin. Opposite of raised design elements
Inscription - words or legends on a coin
Intrinsic Value - Value of a coin based on its metal content an not its face value or collector value.
Junk silver - common date silver coins removed from circulation for their melt value
Key date - coins that are considered scare due to low mintage or low surviving specimens for that date (and possibly mint mark).
Laureate - head crowned with a wreath or laurel
Legal tender - money or currency that is backed by a government – used for exchange
Loupe - a magnifying glass – helps for grading coins
Luster - the amount and strength of light reflected from the surface of a coin
Matte Proof - experimental proof coin that has sandblasted or acid-treated surfaces
Mercury Dime - nickname given to the winged liberty dime series from 1916 to 1945 due to the designs similarity to the Greek God Mercury
Mint - Coins are struck in facilities called "mints." There are private and governmental mints. Only mints run by governments produce legal tender coins.
Mint mark - a small letter or mark on a coin that identifies the mint at which the coin was made
Mint set - set of uncirculated coins packaged and distributed by a mint
Mint state - "MS" coins that do not circulate and therefore have no signs of wear are considered "Mint State"
Mintage - The number of a specific type of coin produced at a mint in a specific year.
Moneyer - a skilled worker who coins or stamps money
Motto - Many coins contain phrases or words that are an important principle of the country that mints them. "In God We Trust" is an example of a U.S. motto.
Mule - a coin struck from two dies not originally intended to be used together
Nordic Gold - contains no gold while giving a gold like appearance, being composed of copper, aluminum, zinc, and tin. Its composition is 89% copper, 5% aluminum, 5% zinc, and 1% tin.
Numismatics - the study or collection of coins
Obverse - The front or face side of a coin.
Off center - coins that are struck "off center" by the press. These coins can be slightly off center, in which case you will see one side of the coin has a larger border than the other. Coins that are struck significantly off center will be missing part of the design, since the planchet will have been missed by the die
One Year Type - A major coin type that was only issued for circulation for just one year.
Overstrike - a coin that has been struck again over the previous strike.
Patina - green or brown surface film found on copper or bronze coins due to oxidation.
Pattern - an experimental coin from a mint, typically minted to test a new design, or concept, or potentially to test new manufacturing processes.
Pellet - Raised circular ornament sometimes used as a spacing device in the inscription.
Planchet - flat piece of metal on which a coin’s image is struck. The planchets are typically prepared for coin striking in a specific process by the mint.
Privy mark - Secret mark incorporated in a coin design as a security device or to identify a particular die used.
Proof - term used to describe a coin minted from highly polished planchets and dies resulting in a well-struck coin with highly reflective fields.
Proof set - a set of proof coins of packaged and distributed by a mint
Proof-like - term used for uncirculated coins with mirror-like fields.
PVC - "Polyvinyl Chloride" is a softening chemical used in plastic flips and protective sheets.
Raw coin - a coin that has not been graded or "slabbed" by a grading service.
Reeded edge - edge of a coin with grooved lines that run around the entire perimeter of the coin
Relief - when a coin's design is raised above the surface (opposite of incuse).
Replica - a reproduction of a coin, typically does not have much numismatic value.
Restrike - coins that are minted using the original dies from a previous strike, but the minting is done in a different year.
Reverse - back side of a coin ("tails")
Reverse Proof - Proof coins have shiny fields and frosted devices (designs) whereas reverse proof coins have frosted fields and shiny devices.
Rim - circular raised area around the edges of the coin.
Satin Finish - Uncirculated coins made with specially prepared dies so the coins would have a beautiful satin finish—smooth, but not as shiny as a proof.
Series - collection of coins containing all mint marks and dates for a specific value and design.
Sheldon Scale - grading system (from 1 through 70) that was codified by Dr. William Sheldon. This scale is used today for grading the quality of many coins.
Sintering - The welding together of small particles of metal by applying heat below the melting point. Typically occurs during the annealing process of coin planchets when the annealing drum has not properly cleaned and minute amounts of the previous medal (like copper) are left behind in the drum. Notable examples are the sintering of nickel coins were copper adheres to the nickel finish of a planchet giving it a gold tint or copper colored finish.
Slab - an archival plastic holder used for encapsulating coins, they are issued by grading services for coins that can be graded and assigned a numeric value. The slab has the date, grade, mintmark, issuing service name and ID, quality and any special notes such as PL for "ProofLike."
Slider - a coin that is graded AU but looks good enough to be BU. May be improperly sold as BU by less than scrupulous dealers.
Strike - the actual minting or stamping a coin planchet with its design; can also refer to the quality of a coin (i.e. This coin has a good, solid strike).
Surface - The reverse and obverse of a coin; can also refer to the fields only.
Token - Coin-like piece of metal, plastic, wood, or other material issued by merchants, local authorities, or other organizations, often during periods when government coinage is in short supply.
Toning - some coins acquire a colored or darker tone over time due to age and the metals oxidizing or otherwise becoming tarnished.
Trade coin - Coin produced for use outside the country of origin as part of international trade.
Truncation - Stylized cut at the base of the neck of a portrait, sometimes the site of an engraver's initials or mint mark.
Type - a representative coin from a given series. Type coins are collected based on the series they exemplify instead of its date and mint mark
Uncirculated - coin grade with no signs of wear, it must also have never been circulated (also considered "mint state" or "uncirculated")
Variety - coins that are variations of the original coin design are considered varieties. Alteration of the Morgan’s tail feathers are an example of a Morgan variety.
Vis-a-vis - Descriptive of a double portrait in which two heads face one another.
Weak strike - A coin struck with insufficient pressure resulting in the design elements showing less detail than they should. Weak strike coins are commonly under-graded as they are typically mistaken for low grade coins.
Wheaties - nickname given to the Lincoln cent series from 1909 to 1959
Whizzing - creating artificial luster on a coin by brushing a coin with a motorized cleaning device. This lowers the value of the coin since the coin is physically damaged by the process.
Year Set - set of all coin denominations for a given year, sets may or may not include all mint marks
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