Well... The material, perdernales, (has many variation names), is from Texas as i can see you are from, so thats a good sign thats it is ancient. It does look crude, and irregular as to any particular type, especially on the blade tip/edge. Maybe an ancient piece and tampered with a little? Maybe about 10/20 bucks if modern or 'fixed' up recently, (and depending on buyer) if ancient, maybe 50 bucks since its about 5"... Better flake scars and closer resembling a listed type would have it higher, but simples knives like these are common and never demand too much money at shows unless there is fine craftsmanship... Thats my 3 cents for ya