Although described as a regular dies trial piece, these were actually deliberately struck for sale to collectors as part of complete copper sets. About a half dozen are known. A single example ex Seavey Descriptive Catalog (1873) #1056, Parmelee (1890) part of lot 175 is known struck on a cent planchet. This is a mint error and should not be confused with the die trial. For additional information about this, click here. This is a composite. Photos used courtesy of Stacks.