Although these are described as regular die trial pieces in the standard references, it is more likely that the off-metal 'trials' of this year were deliberately struck for sale to collectors.
Examples were struck in the following combinations:
Copper J1038/P1173 with fewer than a half dozen known including the piece illustrated below.
Aluminum J1039/P1174 with 3 believed known including the illustrated one, ex-Farouk, Heritage 6/04, Heritage 11/04, Heritage 3/05. One of the 3 is slightly impaired.
Nickel J1040/P1175 with only the Woodin-1914 ANS exhibit, Newcomer, Farouk coin known.
Photos courtesy of PCGS.