Pure 1 oz 999 copper round with "Aztec Calendar" design. 1 oz. Copper Round Aztec Calender .999 fine Design: Front: Features the famous Aztec calendar stone with intricate details. Back: Image of "Cuauhtémoc", the last Aztec emperor, with engravings indicating weight and purity. Specifications:- Metal: 999 pure copper (99.9%) Weight: 1 oz Diameter: 39.3 mm Edge: Reeded Mint: Golden State Mint Quantity: Comes in a plastic tube containing 20 pieces (ounces). 📍 Rounds (ounces) are considered special for collectors or those wishing to invest in metals.