Just to add to the confusion....
The highly embellished $30,000 rifle was displayed at the last 2 KRA meetings and the owner claims that Jno was a signer of the Cumberland Pact. You can find the names listed here:
http://www.cumberlandpioneers.com/cumberlandcompact.html There is a John Wilson listed. The pact was dated 1780 and if born when claimed Wilson would have been about 20.
Now, another expert posted this narrative on a display about Jno Wilson:

His narrative says the rifle is "signed as such" implication that it is on a silver plate on the barrel. That is not correct. Hard to see it but it is the top gun in the photo and there is no silver plate
More importantly however is this rifle does share similarities to the one offered for sale. But yet clear differences. Sorry I do not have detailed photos to show those.

Both of these experts have variations on the makers and they both cannot be correct, OR better to say they would not have been made by the same maker. Yes, each version may be accurate except they were made by different makers. BTW, Dr. Amos, owner of the one gun, died last week. He was a highly regarded member of the local community and benefactor of various historic initiatives.
MAS