Rich Husja used to hunt out of a cabin about 20 minutes from me and he would often stop up here for "show and tell." He brought this one up a couple of times. It's really amazing as to just how light and graceful it actually is, despite having a good sized breech and lock plate that is really a little oversized for the gun. Just a super gun.
If it was mine the first thing I would do would be to remove the old replacement lock parts, certainly the cock and frizzen spring, and come up with something to my eye more appropriate and believable.
This has been defined as a "Moravian" rifle largely based upon the style of cheek carving and the dovetailed toe plate. All I can say is that - again, to "my eye" - the carver does not appear to be the same guy who carved 41/43, nor 42. Nor does it really mesh with the lion/lamb, nor Oerter's griffin rifle, nor the 'two tailed dog.' The side plate does not match up with any of Oerter's very repeatable arrow side plates; this one looks to be a more developed form closer to Allentown (Moll) influence. I have no doubt that it's a Northampton county piece, but if it is indeed a Moravian piece, I think it's possible that it may display a different hand than the usual suspects