It is nice to see this thread revived! As to the unanswered question regarding the butt plate inscription; "To President George Washington, Mount Vernon, A.D. 1791, Virginia". This rifle was found in a house in the 1920's near Jonesboro Pennsylvania, and was purchased for one hundred dollars. Research has not documented it to be Washington's, but the engraving is of the period of the rifle. This rifle is pictured and described in the book "Accouterments" (first volume) by James R. Johnston. This was my source for the above information.