Click to enlargeJ1387/P1531

Although called regular dies trial pieces, these were more likely deliberately struck for sale to collectors as part of complete off-metal sets.

Examples were struck as follows:

Copper J1387/P1531 with only 3 or 4 pieces known.

Aluminum J1388/P1532 also with only 2 or 3 pieces known.

Photo courtesy of Stacks-Bowers.