I think what you have is a really, really nice hoe rather than an axe. I'm not sure of its monetary value. http://twipa.blogspot.com/2010_01_01_archive.html?m=1 This link may help you some. Keep scrolling and you'll find the hoes/axes. Nice looking gathering and outstanding display!!
Where found would be a good start. I see chert and obsidian in your frames. The axe is an unusual design to me with the hafting and bit. Maybe some of these other members can help you some . Good luck.