I would disagree with this. In the '40s, I would say that 30-33mm was much more typical than 34mm+. To use just one example, the largest high-production model made by Mido during that period was 34mm, while that vast majority were 29-33mm. And Mido was a very successful manufacturer during that period, as evidenced by the number that circulate in the market today.
In the '50s the typical case sizes for all brands certainly did grow, and 33-36mm would probably be an accurate assessment.
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