This is a reverse die trial for the 1870 Standard Silver design as used on J963/P1059, among others, struck in white metal. It is unique and is ex Mehl, Stacks 3/93 lot 2551, ANR 7/05, Stacks-Bowers 3/12, Legend Auctions 9/16, Glorious-LegendAuctions 5/22, LegendAuctions 2/23. It is broken into two pieces as described in Pollock and as illustrated above. Photo courtesy of Legend Auctions.