Most watch lovers likely can’t imagine a time when the humble date window found on watches of all kinds today was considered innovative. That it is now taken for granted speaks to the massive and lasting impact that the Rolex Datejust had when it introduced this feature to the world in 1945. Second only to the display of time itself, this is probably the most practically useful information a watch can offer, and watches haven’t looked the same since.
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https://gearpatrol.com/2020/04/18/watchmaking-firsts-the-date-window/