I must appologize for my confusion with computer gizmology right off the bat! Photos duplicated, others lost and two texts lost.
The 'dagger/cross" mark is about 2.5" from the breech on the left side flat 1 /2 visible with the barrel bedded in the stock. The 3 lugs are drilled for pins.
Butt plate and triggerguard are engraved in what may be a Germanic style, the butt seeming to have been cut for the plate rather than vice versa and the triggerguard having sustained damage. The lock, a W. Ketland,is clearly not the original,it, I suspect may have been destroyed in a common episode which damaged the mortise slightly and the upper wrist, tang area and lockbolt side more extensively. The triggerguard may have been pulled loose at that time as well. They were crudely but effectively repaired possibly in service at the same time.
The nose cap is gone and the forestock has no pin holes, rather an enlarged hole in the ramrod channel split, likely for a screw or rivet.
The stock has a faint curl, the patchbox lid, more distinct. The lid may not be original but fits fine and appears to be old.
Three thimbles are evenly spaced, but not really familiar to me as to dating or school of influence.
Wish the earlier lock/locks, despite condition, we're around, 'cause this nice little Lehigh wants to talk! Note, there never was a sideplate...poorboy?
I would genuinely appreciate all of your thoughts!