The first of the modern one ounce Silver Libertad was issued in 1982 by the Banco de Mexico, but a re-design occurred in 1996. The Libertad has a purity of .999 silver and weighs 31.6 grams or one ounce, it was first minted in the 1949. Though it was discontinued for decades after that, it has since resumed production in 1982. The coin generally features the coat of arms of Mexico of an eagle with a snake in its mouth on the reverse of the coin, and the image of the Independence Angel in front of a landscape of two volcanoes on the obverse. Libertads are minted in uncirulated and proof versions, there are also produced in different sizes and sets.