A 1 oz pure 999 copper round with an "Aztec Calendar" design. 1 oz. Copper Round Aztec Calender .999 fine Design: The front features the famous Aztec calendar stone with intricate details. The back features an image of "Cuauhtémoc", the last Aztec emperor, with engravings indicating weight and purity. Specifications:- Metal: 999 pure copper (99.9%) Weight: 1 oz "1oz" Diameter: 39.3 mm Edge: Reeded Mint: Golden State Mint Quantity: Comes in a plastic tube containing 20 pieces (ounces). 📍 These ingots (ounces) are distinguished for collectors or those wishing to invest in metals, and are not currency.