Wrong planchet error 2000-P Maryland state quarter struck on a Jefferson nickel planchet. The coin is smaller than a normal quarter, and also is the weight and metal of a Jefferson nickel. Very scarce as an error, although "average" rarity for the state quarter series (a guesstimate would be that 6 of these are known.) A gorgeous example.

NGC MS-67 with blazing luster and no problems.