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US Army specification 55-1B. 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. It has been described as "reasonably shock resistant and waterproof". They are accurate to 30 seconds per day, and are produced by Movado, Waltham, Elgin, and Hamilton.
Military watch bands had to be hardwearing and secure, and with the additions of spring bars and an added nylon strap, the NATO strap provided the best security. [32] They were also used by many professional divers, since leather straps do not suit water, and they could be adapted to fit over a diving suit more easily than metal bracelets.
A helical torsion spring, is a metal rod or wire in the shape of a helix (coil) that is subjected to twisting about the axis of the coil by sideways forces (bending moments) applied to its ends, twisting the coil tighter. Clocks use a spiral wound torsion spring (a form of helical torsion spring where the coils are around each other instead of ...
Watch strap. A watch strap, watch band, watch bracelet or watch belt is a bracelet that straps a wrist watch onto the wrist. [1] Watch straps may be made of leather, plastic, polyurethane, silicone, rubber, FKM, cloth, or metal, sometimes in combination. It can be regarded as a fashion item, serving both a utilitarian and decorative function.
The balance spring is a fine spiral or helical torsion spring used in mechanical watches, alarm clocks, kitchen timers, marine chronometers, and other timekeeping mechanisms to control the rate of oscillation of the balance wheel. The balance spring is an essential adjunct to the balance wheel, causing it to oscillate back and forth.
Mainspring. An uncoiled modern watch mainspring. A pendulum wall clock movement showing the two mainsprings which power it. This is a striking clock which sounds the hours on a chime; one of the springs powers the timekeeping gear train while the other powers the striking train. A mainspring is a spiral torsion spring of metal ribbon—commonly ...