This bracelet was purchased in the 1940s purportedly Navajo but it could be any tribe. It's inlaid with turquoise, coral, shell and sterling pieces, with high work, not flat, a heavy sterling piece, weighs about 130 grams. The hallmark is a backwards upper case D followed by a frontwards upper case D. Just the two D's. No graphic. This is expert workmanship but I can't find the hallmark anywhere. Any leads would be appreciated.