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Learn about numismatic specific terminologya facility that produces coins reverseThe tails side of the coinalloyA substance composed of several metalsbagmarksSurface marks caused by impact from other coins during the handling process before the coin enters circulationbank rollA common means of distributing coins where a bank would roll coins before distributing them to branches or customersbase valueThe base metal value of a coinbi-metalA planchet consisting of two independent alloys, usually in the form of an outer ring and an inner circle.brillianceThe original colour of a coinbrilliant finishA coin finish characterized by angled reflective surfaces producing a cartwheel effectbrownA copper coin practically devoid of any original mint brilliancebullionThe intrinsic metal value of a coinbullion hoardCoins put away for the purpose of retaining their metal value.bullion valueThe base metal value of a coinbusiness strikeA coin struck for circulationcarbon streakingBlack streaks across a copper coincartwheel lustreThe natural reflectivity of a brilliant finish coin in which luster will reflect down the diameter of a coincentral strike weaknessA weak strike around the centre of the design caused by a lack of concavity in the dies relative to strike pressure.circulatedA coin that has been usedcleanedA state of coin which has been artificially altered to appear as a higher gradecommemorative A coin struck differing from the standard design to commemorate an eventcommercial proofA proof coin produced with the intention of being sold to the general publicdate setA complete set of all years and mintmarks of a particular seriesdebaseThe state act of reducing the precious metal content of a denominationdecimalCurrency in equivalent units of base 10decimal currencyCurrency based on units of a multiple of 10denticlesTooth like shapes around the edge of a coindevicesThe closed, unexposed areas of the designdieA cylindrical punch with an inverted impression of a coin's design used to strike the coindie blobAn incuse mark, usually a contact mark on a working die that causes a blob to appear on any coin struck from itdie clashA ghosted image on a coin caused by the die striking without a planchet in between causing the ghost of each die appearing on the opposite face.die cleaning striationsRaised lines on the surface of a coin caused by abrasive cleaning of the die that struck itdie crackA crack on the die which produces a raised line on the die it produces, or on the coins it strikesdie faulta flaw on the die producing an anomaly on the coins it strikesdie fillFilling of a device on the die with residue, usually oil from die cleaning, causing parts of the design not to be complete when the coin is struckdie numberA number appearing on a coin indicating which die struck it used prior to 1880 in the United Kingdomdie polishing curlsSmall hairline curls on the surface of a coin caused by circular polishing of the diedie polishing striationsRaised lines on the surface of a coin caused by abrasive polishing of the die that struck iterrorA coin struck with a significant enough or amount of flaws that it should not have been permitted into circulationexerguea space on the reverse of a coin or medal below the central design, often containing the date, mint, or other informationface valueThe nominal value of a coinfieldsThe open, exposed areas of a coin's designfilled dieA die with contaminants filling the design causing coins to be struck with missing detailfrictionWear that has not flatted the detail, usually caused during the minting process and therefore acceptable in mint stategeneral releaseThe typical circulation coin of a particular yearhoardA large number of coins found from a single source that have never before reached the collector marketissue priceThe price a collector coin is sold to the public at the time of issuekey dateA difficult date to acquire in any grade, hence being the key to a serieslegendThe inscription around the inner edge of the coinmaster dieA cylindrical punch with an impression of a coin's design used to strike the working dies of a coinmatte proof A type of proof strike that has a sandblasted appearance as opposed to a typical mirror finishminta facility that produces coinsmint bagA common means of distributing coins where a mint stores coins in cloth or plastic bags before distributing them to banksmint bloomThe way light reflects off a coin's original surfacesmint brillianceThe original golden-red-orange-pink colour of a copper coinmint faultMinor problems on a coin caused during the minting process that would not ordinarily have required the coin to be lustreThe original reflectivity of a coinmint masterthe controller of a mintmint rollA common means of distributing coins where a mint stores coins in paper rolls before distributing them to banksmint setAn official set of uncirculated or specimen coins of the yearmint stateA state of a coin that shows no signs of circulationmintageThe number of coins struck of a particular designationmintmarkA marking, usually a letter or dot that signifies which mint struck a particular coinmirror finishThe state of a coin finished with a naturally reflective appearancemuleAn error coin in which the obverse and reverse of two different coins are mixed togetherobverseThe heads side of the coinone-year typeA series that only has one date/mintmark combination availableoverdateA coin with a numeral in the date punched or tooled over another numeralpatternA coin struck as a representation piece of a coin that never eventuatedPCGSAn American based third-party grading serviceperipheral striking weaknessA softly struck legend usually the result of an overly concave die paired with low die pressure.piedfortA coin that is double the thickness of the regular issue.planchetThe piece of metal a coin is struck onplanchet flawRaised, missing or peeling metal off the surface of a coin caused due to impurities in the planchet.pre-decimalDenominations without base 10 equivalentsproofA coin struck from specially prepared dies to strike a superior quality coin not intended for circulationproof of recordA proof or specimen strike intended to represent a circulation piece produced for mint recordsproof setAn official set of proof coins of the yearproof-likeA coin that resembles the appearance of a proof coin of the same type, often resulting from being struck from the same diesprovenanceThe ownership history of a coin or other important collectibleredThe colour designation of a copper coin that has at least 95% of its original mint brilliancered-brownThe colour designation of a copper coin that has between 5% and 95% of its original mint brilliance remainingreeded edgeGrooved lines around the edge of a coin initially invented to prevent filing precious metal off the edge of a coinreliefThe raised part of a coin's designrestrikeA coin struck from a particular coin's original dies after the intended year of issuereverseThe tails side of the coinrimThe edge around a coin, often with beading or denticlesrim beadingBeads or denticles around the rim of a coinrimsThe edge around a coin, often with beading or denticlesrollingThe act of wrapping stacks of coins in paper resulting in a transportable roll of coinsscrap valueThe base metal value of a coinsecurity rollA common means of distributing coins where a security company would roll coins before transporting themsemi-keyA date that is scarcer than the average date of a seriesspecimenA coin struck from an early circulation die state, not intended for circulationsurfaceThe open fields of a coinsurface hairlinesFine surface marks caused by other coins scraping against themtoneDiscolouration of the surface of a coin caused by environmental exposuretoningDiscolouration of the surface of a coin caused by environmental exposuretreasury noteA debt issued by the government much like banknotes are for bankstrialA coin struck to prepare for the striking commercial issues, often to test dies or as a representation piece submitted for approvaltype coinA coin chosen to represent a series in a type set, usually for cost or quality reasonstype setA collection consisting of one coin of each type and possibly varietyuncirculatedA coin which has not been circulateduncirculated business strikeA coin struck through the normal business strike presses not intended for circulation.unifacevarietyA coin which features a slightly different design from that which is normally seenvirgin hoardA hoard not yet searched for key dates or varietiesworking dieThe die with a reversed impression of the coin used to strike the actual coins
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