Vintage Hawaiian Puka Shell Bracelet

Vintage 1970s Hawaiian puka shell bracelet. The shells are natural with natural holes. Well bleached by the sun, pitted and smoothed by the ocean and sand. They are  6.2 mm diameter. Bracelet is 7 1/2" long. Weight: 11.9 grams. Original costume grade clasp that has the silver color worn to the brass base metal. Need to be cleaned.