1968 Gem BU Mexico City Olympic Games Silver One Year 19th Olympics Commemorative Collection. On the reverse is the image of an native Mesoamerican in costume, playing the ancient “rubber ball game” ollamaliztli, with the outline of the “I”-shaped court behind him. The Olympic rings appear below him, and the legend “Juegos De La XIX Olympiada Mexico 1968” runs along the top border. As large as a Silver Dollar. You will get one of the Silver Dollar coins that is pictured here. Comes in a 2 x 3 Frosted Presentation case. Coin weight: 22.5 grams with a Fineness of .720 Pure Silver and has a Coin Diameter of 38 mm and a Low Mintage: 27,182,000 from the Mexican Mint.