The product is a 2004 Wisconsin State Quarter coin with an upside-down reverse error that does not include a mint mark. This particular coin is a single piece from the United States, composed of copper and struck with a proof-like finish. As part of the State Quarters series, this coin represents the state of Wisconsin and is classified as an ungraded, uncertified variety. It is a unique and collectible piece for numismatists interested in unique errors and variations in coinage.
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