Vintage Native American Bone Necklace

How do I know it’s vintage ? Someone gave it to me as a gift ‘72 . Bone carved beads with bits of turquoise in between. Screw closure Very sturdy and wearable still Approximately 22” Men or women 𝔸𝕟𝕪 ℚ𝕦𝕖𝕤𝕥𝕚𝕠𝕟𝕤 ? ℙ𝕝𝕖𝕒𝕤𝕖 𝕒𝕤𝕜 !