Vintage Mexican Waves Ring in Sterling Silver Size 5

Vintage Mexican sterling silver waves band ring from the 1970s. It is a size 5 and measures 5.5 mm wide. Weight: 1.6 grams. 

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.