It is not British, it was made at Lithgow, in Australia, in 1941. It had a factory rebuild (FTR - "Factory Thorough Repair") at some stage, probably in 1945 given that this is the date on the butt. The barrel band probably is original, or at least from the FTR. It looks like it is in reasonable nick. Probably fetch around $400 here, maybe a bit more, but I don't know what they are bringing in the US.