1968 Mexico XIX Olympic Game AZTEC Ball Player 25 Pesos Silver Coin UNCIRCULATED. 1968 XIX Olympic Games Commemorative 1968 Silver 25 Peso 37mm (22.66 grams) 0.720 Silver 0.5175 oz. Designer: Lorenzo Rafael JUEGOS DE LA XIX OLIMPIADA MEXICO 1968 - Aztec Ball player with ball in one hand and waving with other hand, design of ball court behind, Olympic rings underneath. ESTADOS UNIDOS MEXICANOS above Mexican Coat of arms at center, 25 PESOS in field to left, LEY 0.720 OM in field to right.