• Obverse: Stylized Aztec dancer in front of the “Mexico 68” Olympic logo with Olympic rings below; legend “JUEGOS DE LA XIX OLIMPIADA MEXICO 1968.”
• Reverse: Mexican national arms (eagle with serpent), denomination 25 PESOS, mintmark “Mo,” and fineness LEY 0.720.
• Composition: 72 % silver, 28 % copper — actual silver weight ? 0.5209 oz ASW.
• Mintage: ~20 million pieces.
• Condition Notes: Attractive original patina; light cabinet friction; no evidence of cleaning or damage.