The Winchester 97, model 12 and original Super X were made in an era before CNC machining and were basically hand made and fitted by skilled workers. The Remington 31 and Ithaca 37 were made the same way.
If they haven't been left rusting in the barn or a car trunk they will work forever.
Problem is the winchesters have become "Cult" guns and prices have risen accordingly. Like Parker SXS's they are way overpriced.
If you are lucky enough to own or inherit one hang on to it, your grandchildren will thank you.
I am still looking for that Remington 31 I can get for next to nothing because it isn't a cult gun and isn't pretty. But they never seem to be found in used gun racks.