Many people would go down the 'Brooks' saddle route to use on a regular basis. Easy to find, and very comfortable to use.
I know some US bike manufacturers offered "English pattern saddles " as an option in their catalogues during the TOC period, so something like a Brooks would not be inappropriate.
Also you could consider one of
@Paul Watson's superb period replicas of a similar type to the original featured on this Racycle.
It's not a question of what saddle would fit really though. It's more a question of the saddle clamp.
Getting one that fits both the saddle rails and is a suitable size for the seatpost diameter can sometimes be a problem. But not too difficult a problem to solve.