Natural White Hawaiian Puka Shell Necklace 18" long

Vintage 1970s Hawaiian puka shell necklace. The shells are natural with natural holes. Well bleached by the sun, pitted and smoothed by the ocean and sun., They are 3/8" in diameter. Necklace is 18" long. Weight: 50 grams. Original costume grade clasp. Need to be cleaned. Slightly rough, but the real thing!