The first wristwatch chronograph was invented in 1914 by Heuer. It was a pocket chronograph adapted to be worn on the wrist. en.wikipedia.org/wiki/TAG_Heuer
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1868the wrist watch was first invented in the 1920's.
Wristwatches were developed by miniaturizing navigational chronometers.
Wristwatches were developed by miniaturizing navigational chronometers.
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