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About Error Coins: Nearly every misstruck or error coin is unique, which makes them enjoyable to look at and collect. In 2002, the mints changed their production methods which resulted in fewer errors released into circulation. As a result, prices for error coins dated after 2002 are much higher. Examples of major errors: clipped planchet, multiple strike, blank planchet, defective die, off center, broadstrike, lamination, brockage, wrong planchet and waffled.