1999 Mexico LIBERTAD 1.0. 999 Silver coin 1 Onza PLATA PURA. Low Mintage: 95,000. NGC CERTIFIED: MS 69. Mexican silver coins are among the best values in silver. Mexican Onzas are in high demand worldwide and growing. Please pay for your items within 24 hours of winning. Thank you very much for looking. Check out my other items here. Mexican coins historically have a very strong following. “(The December Error) in which a planned a 15% devaluation sent our neighbors “FIAT currency plummeting over 50% overnight! And now even have a stronger following!