Rookhawk,While it is hard to make a declarative statement without seeing it in person, it looks like a very good barrel job and I think I see the tig welding work that shows how it was done. What it looks like to me is the original barrels were used to create the new barrel set. Specifically, the breech was turned into a monobloc, chopping off the old barrels and then tig welded to the new tubes. Relaying the top rib from the original would be a likely conclusion which again is a pretty good idea. I think I see the barrel tubes sleeved through the monobloc and then dressed down at the breech face. (hence the minor dings to the breech where the original 1909 barrels are still used but the chambers are new, connected to the entirety of the barrels) If I was to pay to have barrels redone I would prescribe the work to be done exactly as it appears this work was done.
It all looks like it was done by a very skilled gunsmith, not some shadetree schlock. Lack of proof marks in my opinion points to an American or Canadian expert that was not required to prove the gun to any legal requirement whereas if Austrian it would be illegal not to reproof the gun in Ferlach.
Have you reached out to Rigby to find out the provenance of the gun, the original LOP, and the original caliber? It would strengthen its value if it was always a 470NE and if the original LOP was shorter than the current LOP indicating original stock with steel butt was lengthened by the beautiful pigskin covered pad.
I truly appreciate your perspective, thank you.
In your opinion have I mischaracterized the rifle as having been rebarreled or should I have said sleeved ?
Below is the Factory letter, showing original 470 build but with a 14 5/8" LOP now shortened to 13 3/4". Maybe when the work was done, new leather pad added ?