Mint Errors Page

Obverse of Sacagawea Dollar - Struck 18 Times     Reverse of Sacagawea Dollar - Struck 18 Times


DOUBLE- AND MULTIPLE-STRUCK COINS

When a blank planchet is struck by the dies, the normal procedure is for the feeders to eject the struck coin out of the collar and into a chute. If there is a malfunction and the struck coin isn't ejected, it may receive a second or third strike by the dies. A multiple struck coin can happen in many ways and have many combinations of errors. 

Images courtesy of Byers Numismatic Corp

Significant examples:
Sacagawea $1 Struck 18X in an ANACS holder (illustrated above).

Sources and/or recommended reading: