The stock was broken at the wrist & well-repaired with Acraglas, however there is another area on the butt where it may have had some kind of long plaque or medallion glued to it. Sanding & refinishing to remove the excess stock glue & Acraglas will also minimize a mysterious hole in the fore-end where someone filled it back in.
The metal is all dark finish & mirror polish. The lock seems to have never been removed & shows no wear. There is no fly in the tumbler (not made to have one. The barrel band is stamped with a U. The lock has the US Springfield & Eagle weakly stamped. The buttplate has US lightly stamped on top. There are witness marks for aligning barrel to receiver. U.S. Model 1873 is stamped on the forward end of the trapdoor, and 14840 is stamped forward of the tang on the receiver. Looks to be 3 groove rifling & bore looks mint.
Otherwise, there are no other stamps or proofs to indicate the manufacturer. The stock looks like elm, so my best guess is either Armi or Pedersoli.
Anybody know of a manufacturer who built trapdoors without proofs or Mfg. stamps?
After doing some sanding on the excess acraglas - the wrist is ok, there was an area extending fwd of the wrist & over by the lock that was re-glued.