One story tells that the military wristwatches came into use when a German naval officer needed to know the time but could not pull out a pocket watch since both his hands were busy operating the machine.
This watch was known for its luminous hands and markers, had a seven jewel movement, an olive drab cotton strap, and a stainless steel case.
[2][3] The B revision was meant to provide a single standard for a 17 jewel watch with a life of at least two years.
[2] It required a 17 jewel bearings, stem wound and set, a power reserve of 36 hours and a 30-second daily accuracy rate.
Drawing C 8636227 was to be used for the band, but was amended on January 12, 1966, to now follow the newly published MIL-S-46383 Type II strap – color black.
Bulova alleged that Benrus merely imported cases and sold watch movements from foreign sources.
[1] Specified by MIL-W-6433A[6] Navy spec for submersible watch, with rigorous dust and moisture specifications, tested under pressure while submerged in water.
[1] As the US military gained experience with amphibious landings they developed new strategies, one of them was the Navy's formation of combat demolition units.
Depollier ads claim that the US Army Signal Corps used the case to protect watch movement stores in long-term storage.
The crystal is tempered glass with a metal rim soldered to the case, creating a watertight seal.
With the advent of SCUBA diving, the canteen watches, limited to 49 feet, needed to be replaced.