This strange concoction was made by Montroville Dickeson combining the rusted half eagle obverse used by him or Joseph Mickley to strike J38-J40/P6110-P6120 combined with the eagle on rock obverse used on JC1792-1-JC1792-2/P6001-P6005.
Examples were struck in copper with probably 3 or fewer known. Old listings for these include Frossard's 5/1882, Brand journal id #68340 and Mehl's 2/44 Roach sale.
None had been seen in recent times until July 2007 when the illustrated piece above appeared on Ebay and then the piece below was offered by Heritage in their August 2007 ANA sale. The former was also offered in Stacks 11/2007 sale.
Photos courtesy of Ebay and Heritage.