So here's a non-Omega perspective. To a dyed-in-the-wool chronograph collector, it's funny you are so hung up on an Omega. And it's funny that you should resort to a Breitling as a "poor-man's" option. Are you aware that there is a whole population of circumspect, widely-experienced Breitling collectors that would chuckle politely if you suggested Brietling is in any way a second choice to Omega, of all manufacturers? OMega is a more than honorable house, but not notably a chronograph manufacturer. When I think of Omega, I think of chronometers, Constellations, Centuries, Cosmics, and only then chronographs (esp if you exclude Speedmasters). Breitling is surely a chronograph house, but well saturated with collectors and in large part because the modern brand has a certain following, rather "fully priced" in my opinion. When it comes to chronographs from the era that you seek, the chronograph collector wonders that you seem oblivious to Minerva, Angelus, Gallet, Universal, Movado, etc. All of these are more obvious options than Omega, and maybe even Breitling.
BTW, this will happen:
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