Check out this link from AmericanLongRifles.com
http://americanlongrifles.org/forum/index.php?topic=12718.msg137247#msg137247
From that link, it appears Mr. Burton was active in the late 60s-70s. He also appears to have numbered his guns. Do you see any other engraving?
It certainly is a beautiful piece! Put a flint in it and fire away!
As to value, i know my dad sells the ones he has made for $8-1,000.
#114 is the number on the gun. seems like a cannon, measured in right around 5 feet and rather heavy yet a nice balance to the gun. It even has carved out a nice cheek rest on the stock
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