Vintage sterling silver native best american turquoise leather belt and buckle

Product Name: Vintage sterling silver native best american turquoise leather belt and buckle
Black leather belt is vintage and shows signs of wear, but overall is in good condition. Has 12 individual pieces of turquoise. Possibly Native American, maybe Navajo made. Has signature/stamp/makers mark R/P on the back. Leather strap measures about 45 inches I believe the buckle is heavily tarnished sterling silver - it is non-magnetic, has no odor, leaves black tarnish residue when polished with a clean white cloth, and melts ice best extremely quickly.