Gorgeous Vintage Navajo Turquoise and Sterling Silver Ring

Stamped with maker’s mark on back, but it has mostly rubbed off. A picture of the maker’s mark stamp on the back of its sister ring, which is also for sale in my closet, is shown (last photo) to verify the provenance of this one as well. I am selling this one at a lower price than it’s sister ring due to the maker’s mark being somewhat rubbed off with normal antique-wear. This ring is in great vintage condition. Unsure of size. Chunky statement style ring, such vibrant colors.