Vintage Mexican Azteca Ring in Sterling Silver Size 11

Vintage solid sterling silver Azteca style ring made in Mexico in the early 1980s. It is a size 11 and measures 6mm wide. Weight: 3.3 grams. Hallmarked inside. 

This came to me from a man that found a large amount of rings on the beaches of Mexico and Southern California with a metal detector. The majority of them are from the 1970s and early 1980s.