I recently inherited what may or may not be an English SXS 12 ga. side lever double hammer shotgun from my father-in-law. It has been passed down from father to son for at least 3 generations. I have tried to research as much as I could and the information below is as accurate as I can determine.
The gun is marked "Thos. Forsyth London (Laminated Steel) on the rib at the breech end of the barrels and has "Forsyth" engraved on both sideplates. It has Birmingham black powder proof marks from the 1868-1875 period and the water table has Birmingham view marks. The back action hammers are non-rebounding. It is obviously not a fancy gun, the engraving is fairly modest and shallow.
I am not interested in the value of the gun, only the history if available. It may even be a JABC, although I can't find anything pointing obviously in that direction.I have no intention of firing it, it is a wall-hanger only. Any information would be appreciated.