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inspector marks, sn, proof mark, etc..
in 1887
From markings and proof marks on the gun barrels and the frame. In some cases you need to remove the barrels, and look on the underside from markings.
Barrel marking include the proof marks, choke code and weight of the barrels. Please be specific and we can give a more direct answer.
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I would assume what you are looking at are Belgian proof marks. Which, of course, tell the country of origin and not the manufacture. The P.V by the way implies that the firearm has been nitro proofed.
I suspect that your Winchester may have been used in Canada...hence the British proof marks? I suspect that your Winchester may have been used in Canada...hence the British proof marks?
These symbols are proof marks that were used by the belguim goverment to show that the gun in question passed there pressure tests that were required prior to shipping the gun.
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Inspector marks, assy marks, proof marks
There is a Belgian proof mark for smokeless powder that resembles what you're describing. You usually see proof marks on the barrel flats (breech end of the barrels on the bottom side). Another common Belgian proof mark is the letters ELG inside an oval.
It is a "Trade Brand Name" shotgun made by English gun maker Joseph Bourne & Son. There should be English or British proof marks for the Birmingham proof house (Crown over either the letters "RP" or "NP" depending on when the gun was proofed). Proof marks should be on the bottom of the barrels. They made medium and high quality shotguns. The vast majority were exported to Southern Africa and India.