Although these are described as regular die trial pieces in the standard references, these were deliberately struck for sale to collectors as part of complete off-metal sets. Examples were struck as follows: Copper J739/P820 with about a half dozen known. Aluminum J740/P821 with about a half dozen known. Nickel J741/P822 with only the Newcomer, Lohr, B/M 2009 ANA sale believed to exist. Photo courtesy of Heritage.