Native American Large signed vintage sterling silver turquoise spiney oyster pendant, 1970s. The back is signed with what looks like, “RP” or “RR” (with partial second R) and tested as sterling silver. Weight: 23.5 grams. Length: 2 9/16 inches. Widest point: 1 5/8 inches. Bail opening diameter: 4.4mm or 3/16 inch.