Old Vintage Rustic Silver Metal Deco ? Hand crafted hook.

This handmade knife was found at an estate sale of a very old individual. It's handmade using some kind of hard plastic or resin as the handle and it is held on the knife blade with copper rivets ? The inside of thehook is very sharp. Fits nicely in the hand. I suspect it was used in hunting . This is a one of a kind knife and is very durable. Please email me with any questions