There isn't much in it, I guess that a Seamster 600 is, what, 33.5-34mm? The reference of Constellation shown here (which, btw, is still extremely well priced in more common dial variations!) is 35mm. I've had one Seamaster 600 and remember that I was surprised at how small it was and at that time I was in no way used to wearing big vintage watches - most I had at that point was 34mm-ish.
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