The 2018 1 oz Mexican Libertad. 999 Proof Silver Coin is a prestigious piece of Mexican Mint. This coin is struck in proof quality with a fineness of 0.999 and contains 1 troy ounce of silver. The coin depicts the Mexican goddess of liberty, Libertas, facing the Statue of Liberty on one side and a stylized eagle with wings spread on the other side. The coin is a popular choice among collectors and investors alike, and its price is determined by the market value of silver. Highest Ratings from Buyers. We thank you for your interest in our auctions and listings. We at CoinBox Gold & Silver are a brick & motor Full service Coin Shop in the Greenville, SC area.