Coin Error Guides
Expert guides to identifying valuable minting errors. Learn what to look for, how to check, and what your coins could be worth.
Scan Your Coin NowDoubled Die Coin Errors
A doubled die is one of the most sought-after coin errors. It occurs during the die-making process when the hub impresse...
Error Type GuidesOff-Center Strike Coin Errors
An off-center strike occurs when the coin blank (planchet) is not properly seated in the collar before the dies come tog...
Error Type GuidesDie Crack and Cud Coin Errors
Die cracks and cuds are among the most common mint errors. They occur when a coin die develops cracks from stress and fa...
Error Type GuidesClipped Planchet Coin Errors
A clipped planchet error occurs when the coin blank (planchet) is not properly cut from the metal strip, resulting in a ...
Error Type GuidesBroadstrike Coin Errors
A broadstrike occurs when a coin is struck without the retaining collar that normally holds the coin blank in place and ...
Error Type GuidesWrong Planchet Coin Errors
A wrong planchet error occurs when a coin is struck on a blank intended for a different denomination or even a foreign c...
Error Type GuidesDie Clash Coin Errors
A die clash occurs when the obverse and reverse dies strike each other without a planchet between them. This transfers f...
Error Type GuidesStruck Through Coin Errors
A struck-through error occurs when foreign material gets caught between the die and the planchet during striking. The re...
Error Type GuidesLamination Errors Guide
Lamination errors occur when impurities, gas pockets, or improperly mixed alloys in the planchet cause layers of metal t...
Error Type GuidesRepunched Mint Mark (RPM) Guide
Repunched mint marks (RPMs) occur when the mint mark was manually punched into the working die more than once, resulting...
Error Type GuidesMule Coin Errors Guide
A mule error occurs when a coin is struck using two dies that were never intended to be paired together. This can involv...
Error Type GuidesDouble Struck Coin Errors Guide
Double struck errors occur when a coin receives two or more impressions from the dies, typically because the coin failed...
Error Type GuidesMost Valuable Error Coins
Error coins are among the most valuable collectibles in numismatics. Manufacturing mistakes at the US Mint can turn ordi...