Just to close the loop . . . Purdey has responded that they do not believe the barrels now on the gun are original Purdey barrels, nor have they records of having been involved with their replacement. I've decided to pass on purchasing it for these reasons. Incidently, the gun is priced at $2,799.99. I don't know the wall thicknesses and the seller doesn't have a gauge, but does offer an inspection period.

Wild Skies
Since 1951