I have a 12 gauge side by side made by Robert Jones of Manchester Street, Liverpool England. Here is a photo of the proof marks:
From a PDF of proof marks I got off the Internet, the marks indicate:
The crown with NP below indicates it is "Definitive Nitro Proofed for All Guns" and the crown with BV below means it's a "View Mark" (whatever that means) and both have been in use since 1904. The crown with BNP below indicates it "Definitive Nitro Proof for Barrel and Action and has been in use since 1954. All marks come from the Birmingham proof house.
Now from these is it possible to date the gun? For instance was the gun reproofed after 1954 or were all the proof marks added at the same time? Also, any idea what the other markings mean?
Thanks
Alan
