A closer look at my recent find

I have started to be more clear as to why I think this is a legitimate arrowhead. For example consider the symmetry and flaking:

 Other side:

It is another "flake" point. The stem is much thicker than the tip:

Here is a clincher: the details of finer serrations along just one edge:

Interestingly enough, I first saw this on the glass 'arrowhead' serrations. It suggest this is a knife, not a projectile point, which is consistent with the awkward stem.