So far its between a vintage Seamaster and Constellation with the 564, 565 or 751 movements between 1966-1967. That would be the ideal but the way I feel right now I would almost jump on any vintage Omega haha!
I was going to recommend the Seamaster. Many shapes/sizes/dial combos. Stick with the 56x and 75x for the best quality (from the factory, as specific examples 40-50 yrs later are subject to inspection for overall condition).
Personally, for style and nearly-as-good quality, I would broaden the search to include older 50x movements. Of course taste is subjective but some of the best designs were late 50's-early 60's.
Follow the advice given about getting opinions on condition/originality/value, but be prepared to provide high res pictures to include the movement and inside case back to get opinions. Also be warned when you bring an example to the spotlight here for examination, a troll may try to beat you to it when it's brought to everyone's attention.
Constellation examples are in greater demand, higher priced, subject to great scrutiny, and (I'll certainly be slapped for this) not as good looking as the Seamasters. There I said it! Again, taste is subjective and I'm probably in the minority on that call.
Bottom line, have patience, seek advice from knowledgeable collectors, be patient, prepare for service by a qualified watch maker, don't rush in to a purchase, and be patient. Also, take your time. Am I being Captain Obvious when I say have patience? It's the hardest thing to do when you get excited about the hunt. The good news is, as you assemble a collection, the excitement for the hunt does not diminish. Well, good news for the psyche, not the wallet...
