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Lincoln Wheat Cent Defective Planchet
Jefferson Nickel Broken - Defective Planchet
Defective planchets are errors that occur before the strike and are when planchets are somehow damaged during their creation. There's numerous ways a planchet can be defective and obtain damage and each piece must be examined for authentification and to determine the catalyst for the damage. Some defective planchet mint errors look like post mint damage (PMD) but the difference is that the planchet was damaged then struck with a die whereas PMD occurs after the strike and after the coin leaves the mint. Close examination of each coin is the determining factor.