Vintage Estate Hawaiian Puka Shell Necklace with Black Coral

Vintage estate Hawaiian puka shell necklace. This one has black coral spacer beads. It is 15 1/2" long. Pukas are 6.9mm in diameter. Totally natural with holes that were created by natural, white color bleached by the sun and a smooth surface from being tumbled in the Pacific Ocean. Costume grade barrel clasp. Weight: 29.2 grams. Last two photos show it with two other necklaces from the same estate. C. 1970s.