NGC 1976 bicentennial half struck on a quarter blank. The coin is struck on the much smaller 25c blank, and has the weight and metal of a quarter, but is struck with the half dollar dies...
PCGS Botswana 1977 50 thebe off-metal struck on a foreign 7.0 gram planchet. The coin is smaller than normal, and is some sort of copper alloy.
A scarce and dramatic off-metal. Not a...
NGC 1876 1 mark struck through a 20 pfennig planchet on its obverse. The planchet strike thru measures 16 mm. The error occurred when a 20 pfennig planchet was laying on top of this coin when it was...