50-Dollars, Series of 1862, National Bank Note Co. (Fr. 148; Hessler p. 142), green and black face Proof, india paper on card, together with a green back Proof, also india paper on card, mounted back to back, the face lacking seal, signature and serial number overprints, plate position D, punch cancelled six times along the signature lines, some glue stains on the obverse otherwise generally excellent condition and extremely rare