White Hawaiian Puka Shell and Red Branch Coral Choker Necklace 1970s

Vintage 1970s White Hawaiian puka shell choker necklace with red branch coral and silver tube beads. (I don't know if they are sterling. Original non-sterling barrel clasp. Measures 14 1/2" long. Pukas are natural. Holes are natural, the white color was bleached by the sun and the polish was done by the ocean waves and sand. Shells are 7.8mm in diameter.