Osprey, I am with you on this one. The sideplate bothers me a little too, as does the patchbox lid engraving. I have not seen much decorative engraving on Beck rifles before this one. But, the overall gun is pretty much stunning with high art carving in a somewhat early style for Beck. This clearly is a 1700s gun, possibly sometime in the late 1780s. Wish it was up on my wall.
Dick