50's for dress watches, 60's for tool watches.
But if we're choosing one Year of the Watch, I'm in full agreement with pitpro about the first International Geophysical Year, especially as regards tool watches.
Some others that come to mind:
1958 Tudor 7924 Big Crown
1958 Blancpain FF Mil Spec 1
1958 Zenith Port Royal cal 135
And (almost) the 1959 JLC Deep Sea Alarm (surely it was in the design stage, at least).
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