Bertha Aztec Calendar Sterling Silver Pendant Brooch Vintage 925 Jewelry Pin This is a very large round sterling silver aztec calendar pendant brooch. It measures slightly over 2.5" in diameter and weighs 29.6 grams. This piece can be worn as either a brooch or a pendant on a necklace. It has 2 different ways to be worn as a pendant, the bail on the pin can easily be taken off. Jewelry & Watches, Vintage & Antique Jewelry, Vintage Ethnic/Regional/Tribal