I would think that it would have been re-proofed in 1951 after BSA got it back for refurbishment. They were guns made for the civilian market with a number being bought for the RAF along with some Webley's so never made for military as such. It should have the re-proof mark of the 'R' and the crown but it may have been missed off. I've seen a few guns with marks missed off or applied in error. I have a T.Wild hammer gun with no nominal bore mark so it was impossible to say whether or not it was in or out of proof and I have a Damascus barrelled gun that went in for nitro re-proof and came back with one barrel marked 'Sleeved'. Mistakes do occur from time to time. Lagopus…..
