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Before watches were invented men would calculate the length of day or night using sundials. They were used in Egypt more than 3500 years ago, and they were useful during the day, but not during the night as then there are no shadows, so the water clock was invented. It consisted of a bucket of water with a small hole that leaked water and that was marked accordingly.

The Trench watch, or wristlet, emerged during World War I, mainly because pocket watches got in the way during battle. Some say it was the first step in the transition from pocket watches to wristwatches as it was a combination of both.