The Trench watch (wristlet) was a type of watch that came into use by the military during World War I, as pocket watches were not practical in combat. It was a transitional design between pocket watches and wristwatches, incorporating features of both.
The very first watch that somebody adapted to wear on a wrist is unknown. The first series of purpose-made wristwatches was produced by Girard-Perregaux in 1880 for the German Navy. During World War I numerous companies, including Omega, Longines, and others produced wristwatches for the military. These watches were of virtually identical style with an enamel dial, wide white numerals, and a luminescent radium hour hand.[A] Often they did not bear the name of the manufacturer, though the movement, originally designed in the 1890s for ladies’ pendant watches, was marked "Swiss".[B]
From pocket watches those trench watches inherited hinged front and back covers. The lugs for a strap looked like a thick wire attachment to the classical round shape of pocket watches rather than an integrated part of the body of the later and modern wristwatches.
The name "wristlet" was used until the early 1930s and was eventually replaced by the modern name "wristwatch".
- "[P]owered by radium salts so that it glowed strongly all the time" without resort to sun exposure. While the luminescence only lasted three or four years, the radium paint should be treated as radioactive and dangerous.
- "A book published during the war as early as 1916 "Knowledge for War: Every officer's handbook for the front" by Captain B. C. Lake of the King's Own Scottish Borderers included the list of Officer's Kit shown in the picture. The first item on the list, ahead of otherwise indispensable items such as "Revolver" and "Field glasses" is "Luminous wristwatch with unbreakable glass". The presence of luminous paint and an unbreakable crystal became the signature features of a trench or "Service" watch, and featured prominently in adverts during the war."
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