2016 1 Onza Silver Libertad Proof. The 2016 1 oz Mexico Silver Libertad Proof Coin is a highly sought-after collectible item due to its low mintage and high purity of. Minted by the Mexican Mint, this coin features the iconic Mexican Libertad design and is housed in a protective capsule for safekeeping. With a total precious metal content of. 999 pure silver, this coin is a valuable addition to any coin collection or investment portfolio, showcasing the rich history and craftsmanship of Mexico’s numismatic tradition.