Although described as regular dies trial pieces, these were actually deliberately struck for sale to collectors as part of complete off-metal sets.
Examples were struck as follows:
Copper J1161/P1303 with about a half dozen known.
Aluminum J1162/P1304 with fewer than 3 examples confirmed.
Nickel J1163/P1305 with only the Woodin-1914 ANS exhibit, Newcomer, Farouk, Pine Tree 9/74, Paramount 4/77, B/R 6/79, Stacks 6/10, Simpson-Heritage 4/21, Heritage 7/21 - PCGS62, illustrated below courtesy of Heritage believed to exist.
Photo courtesy of American Numismatic Rarities.