For reasons of sentiment, it might be worth your while checking to see what repairs might be needed, and the associated cost. This will be a Swiss made Waltham, a manual winder it would appear. Many might reply that repairs would likely be more than the watch is worth. Easy for them to say since it is not their father’s watch. It is your decision to make.
The “DAY” and “DATE” windows are kind of quaint.
I haven’t been able to find one with Day and Date windows on the internet.
Try a Google image search. I just did one and a handful with the same dial popped up. eBay and Etsy listing, plus some others.