Although described as regular dies trial pieces, these were deliberately struck for sale to collectors as part of complete off-metal sets.
Examples were struck as follows:
Copper J1255. This is unlisted in Pollock. One example weighing 43.98 grains was found to be 99.4% Copper and 0.6% Aluminum. Others are probably masquerading as a regular issue proof.
Aluminum J1256/P1397 with only 2 or 3 examples believed to exist.
Nickel J1257/P1398 and illustrated below. The illustrated piece is a business strike, not a proof. We believe this piece is actually a mint error struck either on a planchet intended for a foreign coin, a nickel 3 cent planchet, or nickel stock, for either nickel 3 cent or shield nickel stock which was miscut into cent planchets.
The piece is believed ex Gable, Olsen, Farouk, Bolender 10/55, ANR 3/06, Stacks 7/08, Simpson-Heritage 11/20 - PCGS64.
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Photos courtesy of American Numismatic Rarities.