Although described as regular dies trial pieces, this was more likely deliberately struck for sale to collectors as part of a complete off-metal set.
Examples were struck as follows:
Copper J924/P1029 with fewer than a half dozen known.
Aluminum J925/P1030 with fewer than a half dozen known including the illustrated obverse below from Steve Ivy's 10/77 sale.
Nickel J926/P1031 with only the former Newcomer, Lohr example believed known.
Photo courtesy of Superior.