Although these are described as regular die trial pieces in the standard references, it is more likely they were deliberately struck for sale to collectors as part of complete off-metal sets.
Only 2 examples are believed to exist as follows:
1) Stacks 76 ANA, Ivy 10/76 FPL, unknown intermediaries, Simpson-Heritage 9/20 - PCGS65, click on the thumbnail to see an enlargement
2) Farouk, 66 ANA, B/M 10/1987, Superior Auction 88, Superior 10/89:3388, Heritage 6/2002, Heritage 11/2003, Heritage 1/2004, Heritage 4/2009, Heritage 1/2011, Heritage 1/2012, Goldberg 1/2014, Goldberg 6/2020 – PCGS66, illustrated below
Photos courtesy of PCGS & Heritage.