Hi George and Buck. Sorry I have been off the grid the last couple of weeks, a lot of stuff piled up all at once.
George, I removed the barrel of my Kline rifle, the other week and found a stamped P near the breech. I think there was another letter, but it was obliterated by a slight drill mark made for the front lock screw. My guess is that it is the barrel makers markings. I do not know if there is any sort of cataloging of barrel makers and their touch marks. I will send you a picture.
Buck, as you say Andrew's metal work and engraving, etc is very consistent. As I pour over the photos of his work I see consistencies in his C scrolls as well. All of the samples I am aware of are incised except the one you mention, but all have a similar design. I have a few photos of another A+K signed smooth rifle that has relief carving and have gotten permission to post pictures of it. I will do so soon. I am beginning to think this carving could well have been done by Andrew Kline, only in relief. It has the style of Sell, but I don't necessarily think he had to have carved it.
I am also beginning to believe the theory you mentioned about these gunsmith working together or even side by side, has merit. There is a signed A. Ernst rifle that without a doubt has an Andrew Kline Patch box on it and a Michael Edwards rifle that I would suggest the same of, only lacking his signature "edleweis" flower. Kline, Ernst, Edwards, Eister, Zorger, and I think Sell were in York Boro. in the late 1700s early 1800s along with many other gunsmiths.
I have a few other interesting observations I will try to relate latter.
I am going to try to make it to the 18th cent. art. show in Lewisburg, this weekend, I have somethings that may not allow me to make it though. Are either of you going to attend?
Tom