The regular dies trial piece in copper. As with most die trials made from the 1860s onward this piece was delieberately struck. It was presented to A.M. Smith, who authored the Mints visitor's guides.
The illustrated example is believed to be unique and has the following pedigree:
Bolender's 2/36 lot 22, Kagin's 1950s FPL, Heritage 92 ANA, Stacks 3/95, Simpson collection - PCGS66BN.
Photo courtesy of Stacks.