Hi Gino, when I first saw your pics I assumed there were TWO seperate items. Now I see that bottom is the flip side. All of a sudden it's an unusual hand chopper.
I dont think I have ever seen one so carefully worked only on one side. Maybe the knapper was a one side at time only guy and didn't finish it.
Was looking at current ebaY auctions and saw something very similar. It's seller called it a "hand knife" from Wilson county. The auction # is 260224835118 if you wanted to check it out. That other one has most of the cortex on one side left on it too.