Vintage Navajo Stoplight Ring Sterling Silver Size 6 1/2

Vintage Navajo sterling silver stoplight ring. It is set with on turquoise and two red coral stones. Hand hammered shank. If you look closely, you can see the hammer marks. 

Size 6 1/2. Face is 1 5/8" long. Weight: 8.1 grams. Some tarnish. No hallmarks. C 1960- 1970.