Navajo Sand Cast Turquoise Ring in Sterling Silver Size 6.5

Old Navajo sand cast sterling silver sunburst ring set with turquoise. It has a very primitive appeal with good flow marks inside It was cast flat and hammered into a ring and you can see the solder joint at the inside back. 

It is a size 6.5. Face measures 7/8" wide. Weight: 6.9 grams. Beautiful patina. Fred Harvey era.