Side plate outline appears to have been inspired by the dragon side plate on trade guns, or a variation of some earlier English plates. Wonder if it might be a replacement since the engraving is a simple punctated dot border? The only other place that motif shows up is in the cheekrest inlay as part of the whole engraved ornamentation.
After further consideration of the photos, the patch box finials point toward Easton, in my opinion. Many Allentown guns, (used generically here for that region) do not have side plates while most of the guns produced up in Easton did. The engraving on the gun, while not profuse, shows talent and is very pleasing.
The use of silver inlays along the forearm further suggest Easton to my mind. I can't think of many guns made up there
in that region that have inlays, excepting for that school.
Then too, the architecture does not fully reflect the style preferred in the Allentown region. So, guess that to my eye, Easton is a reasonable guess as to its place of origin.
Thank you for posting the additional photos, They helped a lot.
Dick