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These all look expensive to me, about two times what I would pay and probably 50% more than you should pay if you can shop around.
A few points:
A "professionally restored" dial means it has been repainted and this will hurt future value a lot.
Gold plated watches are the cheapest, then gold capped, then solid gold. Stainless steel is usually above all of these or close to a sharp gold case.
Usually, autos are more expensive than manual winds.
I see these are all recently serviced which is a good thing but I don't see a warranty. For me, I'd only buy from a dealer (who has to charge more) if there was a warranty.
If you want one vintage Omega, then get one that looks and feels special - none of these fit that description.
If it doesn't need to be gold (capped or solid) then I see a few nice watches on here. Bear in mind that you need to add 20-25% import duty from abroad.
This from @Shabbaz looks nice. About 拢1250 landed in UK but service history is unknown.
https://omegaforums.net/threads/omega-seamaster-chronometer-168-024-eur-1150.157246/
This is worth twice the ones you have found.
If you have some specific requirements, then you could try adding them here.
Good luck, Chris
@The Hack
If you haven't read this thread then I think it would be a great starting place for you
https://omegaforums.net/threads/learn-how-to-fish.52603/
It's a much nicer watch.
The crystal is wrong and very tall which is causing an odd artefact all the way around the circumference when viewed straight on. In one picture, they remove both bezel and crystal so you can see the dial and that is an odd thing to do. I don't know this Dennison case but the bezel when viewed from the side seems to have an odd profile for this era - it may be correct.
Private seller, no warranty and no evidence of a service so for me, the price is still far too high but I know this isn't easy.
Cheers, Chris