Originally Posted by ed good
thank you...

seems like if one purchases an old gun, (say pre 1940), in the uk, one should have it reproofed prior to export, in order to minimize question of safety...

what is the estimated cost of having a gun reproofed?

and what evidence is provided that gun passed proof?

Ed, the evidence that a gun has passed proof would be the actual proof/reproof and date stamp markings on the barrel flats. I assume all the shotguns coming out of the British Auction Houses & Dealers are checked over, including bore and chamber measurements to ensure due diligence and legal compliance before sale. Holts Auctions makes this statement under their listings re: Terms and Conditions, "Please note all Lots are listed in accordance with UK Law," My understanding is that only the Proof House can place the proof marks. See my attached photo of a barrel flat marked with the associated proof stamps; original proof markings dated 1904-1925, reproofed with "Crown over R" and date marks 1935/1936, reproofed again with 1959 date mark. UK Proof Marks
[Linked Image from i.imgur.com]