This mint error is an 1851 Double Eagle struck on a large cent planchet. It has been listed in appendix B in all editions of Judd.
It is unique and is ex Woodin-1914 ANS exhibit - where described as "Regular dies of the Twenty-dollar pieces struck on copper planchet size of Ten-dollar piece", Newcomer, several Kosoff sales in the 1950s, Judd, Kaplan, Weinberg, Byers (1975 FPL), Weinberg and has been in the Mark Lighterman collection since the late 1970s. It grades NGCXF45BN.
The piece was the subject of an article in the January 29, 2018 edition of Coin World.
Photo courtesy of Dave Camire.