Circa 1910 10c / Una Accion'' Re-numbered IMPERF DIE PROOF in black on India paper mounted on buff card inscribed 'Banco Nacional de Mexico' with engine turned design. Originally numbered 'C 120' and crossed out and re-numbered '25612' below design with 'AMERICAN BANK NOTE CO. N.Y.' imprint below the numbers. This was a design for a stamp to be used exclusively within the Nacional Bank of Mexico on financial transactions. It is unknown if it was ever produced as a stamp. A rare and unique item.