Although described as regular die trial piece in the standard references, these year were deliberately struck for sale to collectors as part of complete aluminum sets.
Only 2 are known, one from the 1995 ANA which was graded PCGS64 and the second, illustrated, ex 73 FUN, Superior 10/90, Southern collection, Simpson collection - NGC67/PCGS67.
One of these, probably the former, is ex Gschwend, Brand, Boyd (per 7/16/41 B.G. Johnson invoice), the other is ex Newcomer.
Photo courtesy of Rick Kay.