Monterrey, Nuevo Leon, Mexico, Banco Mercantil, 50 pesos specimen, ND (1906), series X, certified PMG UNC 64 EPQ. Frampton-M427s2; SCWPM-S355As. Two POCs. Choice note with vibrant colors and "F4163" stamp in top margin. PMG #2505581-008. (Estimate: $500 - 750)