Wow, that is a beautiful peice! Im not an expert by any means, but I don't think its a red river knife. It looks like it has a distinct flute, and red river knives were basically reworked scottsbluffs. I was thinking Meserve at first, but it doesn't have the concave base that is typical of that point. Is the basal area ground? It looks like some type of resharpened paleo point. Either way, its a great find...congrats