Although described as a regular dies trial piece in the literature, it is more likely that this was deliberately struck for sale to collectors as part of complete off-metal sets. Examples were struck as follows: Copper J787. This is unlisted in Pollock. If any do exist, they are probably masquerading as a regular issue proof. Aluminum J788/P875 with 2 confirmed as follows: 1) B/R RCR #21-26 (1974-6) in set, unknown intermediates, Simpson-Heritage 8/21, LegendAuctions 2/23 - PCGS66, illustrated above 2) Lauder-Doyle Galleries 12/83, Heritage 9/21 - PCGS65, illustrated below courtesy of PCGS One of these is ex Brenner-1914 ANS, Brand and the other is ex Woodin, Newcomer. Nickel J789/P876 is unconfirmed. It might be a mint error struck on a nickel 3 cent planchet. Photo courtesy of PCGS.