Silver Turquoise Vintage Navajo or Zuni? Size 7 1/4--7 1/2 Ring

The following item is a fabulous vintage Native American or Southwestern ring. The ring is silver and turquoise. It has two arrowhead shapes with rope detail at the top and bottom. There are three turquoise stones; the center turquoise is accented with four silver balls, two on each side. The band separates into three sections on the shoulder of the ring. I purchased this from a local vintage jewelry dealer who told me it was from the Zuni tribe, but frankly it looks more like a Navajo piece. There is an indented marking on the back of the band, although I don't know if that is what it signifies. It is not marked sterling or .925, but there is no question that it is silver. The ring is very beautiful and definitely a statement piece. It measures approximately a size 7 1/4 on my ring guide. The face of the ring is about 1 1/4 from top to bottom. It's in fabulous condition having light, typical wear expected from a vintage piece. Lovely!!