The Mexican Aztec Calendar 1/4 Troy Oz .999 Fine Pure Silver Fractional Round Coin is a beautifully crafted piece made of pure silver with a fineness of 0.999. This unique round coin features the iconic Aztec calendar design, making it a valuable and collectible item for any coin enthusiast. With a total precious metal content of 1/4 oz (8 grams) of .999 silver, this coin from the United States is a desirable addition to any bullion collection.