Tim, Lehigh style caps are often open ended, with the material wrapping around the wood, into the bbl channel overlapped and riveted, or paratially wrapped into the channel. I have also seen Lehighs with a two piece nosecap, end soldered closed with the second piece of metal.
I don't know this kind of cap, one piece, partially closing the end, the tails, wrapping into the bbl channel, wrapping only the two upright flats.
German caps are often cast, screwed to the barrel. Wood floats back and forth inside the cap.
This cap has NO rivets, relying on the crimp of the sides of the cap. Unusual. Again.
Thinking about barrel channels, this gun has a round channel, only octagon at the muzzle. Note the thimble tab, which is the middle one, is marked with two notches, and those are toward the muzzle. Same way I do it, Taylor, too. This only means that there are certain natural ways of working for the human being. Thimble is sheet made, not cast, and not soldered together. Also note no finish or stain in the barrel channel.
Note also the crooked drilling of the tenon pin. It does the job, tho'. That's what this whole gun is about......getting the job done. If a Rupp, Kuntz or Schuler is a Mercedes, this gun is a pickup truck.
Note just one more thing, the inlet for the barrel at the breech. Round. Staining from contact with the corners of the barrel evident. OOPS! the mainspring inlet broke into the bbl channel. Ramrod hole invades mainspring pocket.