MEXICO. Peso, 1899-Go RS. Guanajuato Mint. PCGS MS-66 Gold Shield. KM-409.1. Wholly immaculate and majestic, this handsome specimen, emanating from the final year of the 19th century, features a subtle matte nature to the fields with a charming iridescence and miraculous brilliance abounding throughout. Undoubtedly a specimen that must be seen in hand in order to fully appreciate all of the beauty that it has to offer.