Turquoise Native bird necklace

Beautiful Native American turquoise bird necklace. please look at the pictures one of the birds is missing a tail. End beads are stamped and I believe these are sterling beads. this was given to me a long term ago by my aunt who is a frequent visitor to the South West. I don't have much more info on this but I don't wear it and hate to have it hiding in a box when it should be worn!