Vintage Large Mexico Sterling Silver Aztec calendar pendant, Mayan sun worship

A fantastically detailed Inca, Aztec or Maya calendar pendant, marked on the back MEXICO and STERLING. It´s not very thick, but feels sturdy and weighs almost 25 grams. The long metal chain comes included, but is unmarked and suspected silver plated. Condition: Really good with small marks of age and use, including some spots to the back and age related discoloration to the front. Size: 1-3/4 inches diameter (4.5 cm). chain length 24 inches (61 cm)