These regular dies trial pieces were actually deliberately struck for sale to collectors in sets.
These were struck in the following combinations:
Copper J1071/P1207 with about a half dozen known including the illustrated example above. Click on the image to see an enlargement.
Photo courtesy of American Numismatic Rarities.
Aluminum J1072/P1208 with fewer than a half dozen known.
Nickel J1073/P1209 Illustrated below. This coin is believed to be unique and was originally part of Judson Brenner's collection shown at the 1914 ANS exhibition. It recently appeared in Goldberg 10/00 and Superior 1/04 sales.
Photo courtesy of Ira & Larry Goldberg's Coins & Collectibles.