That's a beaut. ! Much more typical in size where u are. The area I live in has no native stones.. Sandy. So almost all of our Native artifacts had been traded for.. lot's of trading because we have tons of points.
The closer to the Chesapeake Bay, the larger they can get.
Very nice size, stone and workmanship.
Think of it, their tools last, and r just as sharp as the day they were made.. which can be thousands of years ago. What will our civilization leave behind? No comparison..
You can check on eBay or some such sites for pricing.. they go up and down. Worth quite a bit more than you could get 20 years ago. But it gets high points for condition and size as well as age. Dating can be done through your local archeological society, baring that, try local history dept. at college.
Very nice find ! Congrats.