Trench watch

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.wikipedia
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Pocket watch

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It was a transitional design between pocket watches and wristwatches, incorporating features of both.
They were the most common type of watch from their development in the 16th century until wristwatches became popular after World War I during which a transitional design, trench watches, were used by the military.

World War I

First World WarGreat WarFirst
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.

Watch

wristwatchwatchesdigital watch
It was a transitional design between pocket watches and wristwatches, incorporating features of both.

Girard-Perregaux

The first series of purpose-made wristwatches was produced by Girard-Perregaux in 1880 for the German Navy.

Omega SA

OmegaOmega WatchesOmega brand
During World War I numerous companies, including Omega, Longines, and others produced wristwatches for the military.

Longines

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During World War I numerous companies, including Omega, Longines, and others produced wristwatches for the military.

Radium

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These watches were of virtually identical style with an enamel dial, wide white numerals, and a luminescent radium hour hand.

Universal Genève

Under both trademarks, the horologists created various pocket and trench watches for both sides during World War I. By 1925, the duo created the brand's first patented self-winding timepiece called the Auto Rem, an octagon-shaped men's wristwatch with lozenge-styled hands and a 15-jewel movement.

Waterproof wristlet watch

waterproof wristlet watches
Mechanisms for telling things such as direction, star position, and time on boats date back to antiquity, but World War I was the first time that soldiers wore timepieces on their wrists in the form of trench watches.

Wristlet

Trench watch, a transitional design between the pocket watch and the wristwatch used by the military during World War I

Barrington Griffiths Watch Company

These early conversions eventually came to be known as "trench watches" because of their extensive use among soldiers in the trenches during World War I. Today few companies do such conversions because of the cost and effort required.