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 as follows:
J1352/P1496 with the following 2 known.
1) Simpson-Heritage 8/21 - PCGS66BN, illustrated above courtesy of PCGS.
2) Farouk, G.H. Wolfe-Heritage 1/2000, Stacks 1/08 as PCGS62RED, Heritage 8/10 - NGC62RED, illustrated below courtesy of Heritage
These were also struck in aluminum J1353/P1497.
Only 2 of each are believed to exist.