They were released in Kornies and Weeties cereal. Though the German Wagners set which preceded these was a set of 20, when they were remoulded for the Nabisco factories they were a set of only 12.
These variants have been slowly collected by myself, and are rare finds! Please note these are over 60 years old now, and are in used conditon. Some have scuffs on them or are bent, though this can often be attributed to manufacturing errors.