Although these are described as regular die trial pieces in the standard references, the off-metal 'trials' of this year were deliberately made for sale to collectors.
Examples exist in the following combinations:
Copper J1029/P1164 with about a half dozen known.
Aluminum J1030/P1165 with only 3 or fewer believed to exist including the illustrated example from ANR's 8/04 sale.
Nickel J1031/P1166 which is unique.
Photo courtesy of American Numismatic Rarities.