If you don't mind my opinion, I will also agree. A Benton, specifically a Benton Broad Stemmed. While most Benton have the end of the blade straight to the top of the notch this (yours) has a small inward sweep from the blade to the top of the notch. If you find several similar you may have a new sub variation. But if only one or two may just be a native American altering it slightly to identify with in a hunting group. Stone looks nice and may be from a god supply so several hunters may have used same stone. Just a few thoughts rattling around in my brain. Best of luck and thanks for the photo. I really love to see all the photos that get posted here.
Respects,
~Z~ aka Stan
I drew on the photo to explain. I hope you don't mind me trying to help. If you already know all this I a sorry. I usually have to explain to my friends. LOL
On the photo your edges slightly sweep in and I think it may just be a variation.
Just my 2 cents,
Respects,
~Z~