Vintage Zuni Sterling Silver Turquoise Inlay Size 7 Native American Fish Scale

Front measures 7/8" x 7/16", ring has a slide type design that I'm assuming is some sort of adjustable feature. Size is a little larger than a 7. About 7 grams weight. No maker or purity mark that I can find, but the only other one I found like this (now can't find the listing) was signed on the back middle but this one doesn't appear to have one, if it did I inadvertently ruined it trying to scrap out the "age". This has been in my personal collection for decades. Please look closely at all photos, there are a couple of tiny chips in the turquoise.