Arrowhead Sterling Silver Bolo Tie

Vintage sterling silver bolo tie. The slide is set with an obsidian arrowhead. I do not know if it is an ancient piece or modern. Old fashioned mechanism that is missing a screw. Has a spring that tightens the leather in place, but it stays tight without the screw. Slide measures 2 7/8" by 1 1/2". Tips are sterling as well and have solid silver arrowheads at the tips. They are 3" long. The braided black leather is 35" long. Weight: 50 grams. No hallmarks. Acid tested.