If you don't see any problems after 47 years most likely you will be ok. Only way to know for sure is test the wood and pull the stock off. Perhaps the wood has been replaced already but there could be damage present from the old wood. Personally, at my age, if I liked the gun I'd buy it and not worry about it. After nearly 50 years it should be ok for another 20-30 years. Then let the next fellow worry about it.
I don't know about others but from my experience the fancier the wood the more likely it was to be salt wood in this time period. Perhaps they had a large supply of basic blanks on hand and did not use too many problem blanks. Or perhaps they all just got replaced years ago. But fancy blanks always seem to be in high demand so they stayed in inventory less time which caused guns made in the problem time period to use recent salt cured blanks.
I almost bought a Diania grade 20 many years ago with the best looking factory stock I ever saw on a Browning but I noticed the smallest area on the reciever. The owner was horrified to see it. He sent it to Art's and when they pulled it off it looked like moon craters where they wood touched the metal. For end was perfect. Art's said the for end wood was salt free but the butt stock was salt wood. He was able to weld up all the pits and restore the gun to mint condition.
They ended up replacing the fore end wood as well to get a color match. Unfortunately the new wood was not even close to be first blank in beauty. So the owner ended up with a gun which suffered from the salt wood and was replaced with just a nice looking blank. Art's would not return the bad wood because I suspect he was afraid it would just get sold to ruin another gun down the road. Years later it occurred to me that that gun would have been the perfect candidate for a butt transfer but back then the only butt transfer I ever heard about was when in the military some a-ole would get his butt transfeered.
