On the underside of the rib is P 5428 then an N in a circle 16
On the upper surface of the rib CAST STEEL
On the underside of the barrels, each has a squigely looking proof(EL overlapping?) 18.2 another one of the weird proofs, a star over AC, an arrow? 12 over c in a diamond and the crown over ELG in an oval.
On one side of the lock, Neumann Bros. on the other side MACHINE MADE.
That's about all the info I can give you guys.
SHEP