The odd adjustable choke is called a polychoke and it wasn’t all that odd from about the late 40s to about 1970. Instead of a screw in choke, it was essentially a thread on choke. In fact, it’s kind of the bane of my existance as far as finding nice specimins of used guns in this vintage that DON’T have one. It seemed like everybody wanted to install one during these 3 decades.
IMO, a classic gun deserves a classic look. They were what they were, what would the point in moderizing it be? Why not just buy a new gun and leave the old guy alone?
Also, with family guns and any other heirloom that has a story, I’m always inclined never to do anything that cannot be undone. With guns, I alwasy feel that I owe it to the orignal owner not to do anything that changes it’s story. Maitain, yes, but alter? No.
A high quality rebluing job, chase the checkering, and refinish the stock, and that will get that shotgun ready for the next 50-75 years. It puts it in context, the next time that shotgun will need refinishing, it may well be by your great grandchildren.
Grouse