It’s hard to imagine today that the rattly buzzing sound of a mechanical wristwatch alarm was once cutting-edge gadgetry. This was in the 1940s, however, and when the Vulcain Cricket was introduced, it overcame a number of technical hurdles to be loud enough, compact enough, and reliable enough to be a viable product. The first of its kind, an alarm was a genuinely useful function to have on the wrist. So much so that it found fame and took on a whole other level of status after being worn by multiple US presidents and becoming known as the “president’s watch.”
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https://gearpatrol.com/2019/07/30/watches-you-should-know-vulcain-cricket/