20-Dollars, Act of July 17th, 1861, American Bank Note Co. (Fr. 11; cf Hessler p. 36), payable in New York, green and black face Proof, with red serial number 00000, together with a green back Proof, both on india paper, mounted back to back with a thin card border, plate position A, punch cancelled four times along the signature lines, the left part of the face somewhat ragged, presumably from mistreatment before it was mounted, the reverse pristine, an extreme rarity