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Mint Errors: Double-Strikes A double-strike is a mint error that occurs when a planchet is fed into the striking chamber, and is struck. Normally, it would be ejected by the feeder finger from between the dies, but for "whatever" reason, fails to do so, and is struck again. Double-strikes can be "on-center", off-center, or be multiple strikes on or off-center--there is a wide array of variati …