Although listed by Judd as a regular dies trial piece struck in silver, Taxay describes this as a mint error, struck on a dime planchet which your editor believes is the more likely scenario.
At least 2 examples are known:
1) McCoy (Woodward 1864?), Brand (journal id #18625), Opezzo-Stacks 8/41, Farouk, Judd, Sloss, 79 ANA - Ch AU or better. It was withdrawn from the 79 ANA sale and, to my knowledge, has not appeared on the market since. This piece appears in 2 B.G. Johnson invoices - Boyd on 7/19/1940 and Stacks on 7/8/1941.
2) Heritage 9/08 sale - NGCG6, illustrated above.
Photo courtesy of Andy Lustig.