Let's compare the parts and pieces to other known rifles/makers:
1. The patchbox looks much like a Charles Baum. I saw this before on J. Bates and Morrison, but by far, this is more consistent with Baum. See the KRA DVD for the Bates rifles I am referring too--going from my memory, I think it is quite similar. the patchobx of the Morrison sold at Julia's a few years back is more like Long's concentric half circle side rails.
2. The carving looks more like the Baum shop, than others.
3. The sidelock is most often associated with Morrison, but I think siomeone other than Morrison was making these things and selling them because I know of sidelocks on just about every maker's rifes.
4. The football sideplate is hands down Joe Long, but also on Morrison and Filman in Milton, Northumberland County. Again, the football apears on Baum rifles, too and the cello and puzzle piece shaped cut out is a nice touch--more like the figural inlays from Bates.
5. The others parts are not terribly distinguishing in the Upper Susquehanna. The inlays and finial are interesting with a four pointed star/flower.
Maybe we should take Long from the equation and I should revise my percentages from an earlier post as an equal chance of three makers---Morrison, Baum or Bates. I don't think it is Horn, but you would swear that he was from Union County if his guns weren't signed.