1 oz Silver Bar - Aztec Calendar The Aztec Calendar is an amazing system of tracking days and time as well as the significance of that day and how it would be impactful in a positive or negative spiritually, religiously and personally as well as for an event or occasion. A 52 year 365-day cycle system of 18 20 day cycles that aligned with another 260-day rotation with a 13-day cycle gave every year and day a unique name and number identification. Years, Days and periods have a name and number identification like 7 rabbit 1 wind 7 reed as well as a governing deity. To our current calendar system, this all seems very complex with a lot to remember. Visually the Aztec calendar is a stunning and intricate display and as a round object itself a perfect fit for these fantastic pieces that will make a beautiful addition to any collection. These amazingly intricate and beautiful 1 oz Silver Bullion bars of the Aztec Calendar are made by Golden State Mint and are now available in a new variety of sizes and metals. Item Specifications: Weight : 1 Troy Ounce Composition : .999 Fine Silver Mint : Golden State Mint Condition : Mint Fresh Diameter (≈) : 50.11 mm x 29.31 mm | 1.973" x 1.154" Thickness (≈) : 2.44 mm | 0.097" Edge Design : Smooth IRA Approved: Yes