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http://en.wikipedia.org/wiki/Pocket_watch

Pocket watches are not common in modern times, having been superseded by wristwatches. Up until the start of the 20th century, though, the pocket watch was predominant and the wristwatch was considered feminine and unmanly. In men's fashions, pocket watches began to be superseded by wristwatches around the time of World War I, when officers in the field began to appreciate that a watch worn on the wrist was more easily accessed than one kept in a pocket. A watch of transitional design, combining features of pocket watches and modern wristwatches, was called trench watch or "wristlet". However, pocket watches continued to be widely used in railroading even as their popularity declined elsewhere.
The use of pocket watches in a professional environment came to an ultimate end in approximately 1943. The Royal Navy of the British military distributed to their sailors Waltham pocket watches, which were 9 jewel movements, with black dials, and numbers coated with radium for visibility in the dark, in anticipation of the eventual D-Day invasion. The same Walthams were ordered by the Canadian military as well. Hanhart was a brand which was used by the Germans, although the German U-Boat captains (and their allied counterparts) were more likely to use stopwatches for timing torpedo runs