As I recall, the Blue Book values for a salt wood era gun are similar to non-salt wood guns if the gun was sent back to the factory for repairs. I recently purchased a 1968 Superposed Lightning in 20 gauge. Lovely little gun. It came with the original case and it looks about 95%, but probably could pass the straight-faced test of 100% by many dealers. The gun shows no salt problems at all and I suspect it may have gone back to Browning at some time, but I don't have any receipts. This is a RKST gun and I have heard that most of the guns with salt problems have the FK, although it seems to me I remember seeing at least one RK gun with salt damage at a gun show a few years back. Does anyone know if Browning stamped a mark anywhere on a gun if it was sent back to them for repairs? Much thanks.