If this your first vintage/Omega and the start of a hobby, you may at some point want to sell it on. At that point the condition and originality will become a key determinant of the price you will get back. So nothing wrong with polished cases or replaced hands etc., just that they impact the price and, once you get the bug and start looking at many other pieces, it may start to bother you. Other than that, buy a watch that you really like so you will wear it a lot and “buy the seller” before buying any watch (eg make sure your seller is reputable, with good references and a return policy). Chrono24 is a general commercial watch site, so do not automatically assume that their references are as good as what you get via the forum here.
As for the originality of what you are looking at, I am sure the Constellation experts will chime in soon.
Good luck with the choice and/or hunt...
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