It looks like a watch that was loved and worn well by the original owner. The dial refreshment may have been done during a regular service.
Not all watch owners in the 1950s/1960s considered future perfectionist/pedantic/purist watch collectors in the way they treated their watches.
Bringing it back to pristine condition will be very difficult and expensive.
A new crown and a movement service and you have a nice vintage watch to wear.
I would leave it "shabby chic" on the outside, and even age the new crown to match the case.