I own a 4" model 31-1 that I bought new in 1972 in Georgia.
Serial Number H17XXX. It's still in the original box and unfired.
Also have a box of ammo bought at the same time.
Bought it for the wife and she was never interested.
You're missing one good model, 31-1. I have one I bought new in box in June 1972 for the wife and it's never been fired.
Still have the original box of S&W 32 longs, hope they are still good. Good luck with your search.