2 oz Silver Round - 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 diety. 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 2 oz Silver Bullion rounds of the Aztec Calendar as made by Golden State Mint are now available in a new variety of offered sizes and metals. Item Specifications: Weight : 2.0 Troy Ounce Composition : .999 Fine Silver Mint : Golden State Mint Condition : Brilliant Uncirculated | Mint Fresh Diameter (≈) : 47 mm | 1.85" Thickness (≈) : 4.08 mm |0.16" Edge Design : Reeded IRA Approved : Yes