Katana VentraIP

Trench watch

The trench watch (wristlet) is 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.[1][2][3][4]

Friedberg, M, (article), Timezone.

Wristlets

"The history and evolution of the wristwatch", (article), Quality Time.

Rolex