Coral onyx vintage PUKA SHELL HEISHI necklace-hand made clasp Choker length 14"

Beautiful vintage puka shell heshi necklace with angel skin coral and black onyx, the necklace is graduatied to a hand made clasp, excellent condition, measures 14”, 1/4” width to 1/8” graduated. Possibly American Indian but I don't have expertise to identify it as such, please see all photos for full description, excellent size for layering with other necklaces, I have several that would be great, feel free to make a bundle and I will be happy to work with you for a fair price.