This is a hub trial of an eagle, in copper, believed produced by Anthony C. Paquet for use on a double eagle. It is believed to have been made circa 1857 along with his JA1857-9/P3155 and others he was working on but all of this is not confirmed.
For additional information on this, please refer to the article on the 1861 Paquet dollars in the ANA Centennial Anthology.
2 appear to be known as follows:
1) ex Schulman, R.B. White, Bowers and Merena 9/89
2) Stacks-Bowers 8/11 ANA, Heritage 1/16 FUN, LegendAuctions 1/18 - PCGS62BN, illustrated above.
Photo courtesy of Stacks-Bowers.