Fred Harvey Era Navajo Ring with No. 8 Turquoise Stone Size 5.5

Vintage Fred Harvey era sterling silver Navajo ring. It is set with natural No. 8 Mine turquoise. It's a very nice specimen.( this mine has been closed for many years never to be opened again)  Shank is hand stamp decorated. 

Size: 5.5 Face measures 5/8" long. 3.2 grams. Tarnished,. Marked sterling twice. C. 1920.