Hello and welcome! Your introduction is very comprehensive, but what would be useful is an idea of your budget. That will really help members to work out which references might be suitable for your needs.
1960s Seamasters are quite plentiful and won’t break the bank - though most by this time will be automatics. I have a restored 1956 Seamaster that has manual wind cal 420 and I love its simplicity and elegance. I only show it because you’ve stated that you wouldn’t be against a redial/restored example and are looking for a daily wearer:
But I also have an original C-case Constellation from c.1970 and I love the style of this, even if it might not be to your taste. They can be had for a little less than other Constellation models and are really excellent watches:
My C-case has the automatic cal 564, one of Omega's finest movements, IMO.
I love both pieces for their versatility and clean design - both can be dressy or casual and are understated and classy in their own way.
My Seamaster was bought at a premium from a dealer; the C-case from the Private Sales here. Don’t forget to factor in a service into your budget and happy hunting!
EDIT: I see others have weighed in since posting, and the advice there is excellent. I can only echo it.
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