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Water Resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against the ingress of water. It is usually accompanied by an indication of the static test pressure that a sample of newly manufactured watches were exposed to in a leakage test.
Waterproof (or water-resistant) describes objects unaffected by water or resisting water passage, or which are covered with a material that resists or does not allow water passage. In horology, the waterproofness of a watch is defined by its resistance under pressure.
The watch wristlet waterproof was a type of watch manufactured in Switzerland and issued to British military forces after 1945. The (WWW) standard for wristwatches by the Ministry of Defence (United Kingdom) is believed to be one of the first official standards for a military issue watch.
A diving watch, also commonly referred to as a diver's or dive watch, is a watch designed for underwater diving that features, as a minimum, a water resistance greater than 1.1 MPa (11 atm), the equivalent of 100 m (330 ft). The typical diver's watch will have a water resistance of around 200 to 300 m (660 to 980 ft), though modern technology ...
The watches are tested in static or still water under 125% of the rated (water) pressure, thus a watch with a 200-metre rating will be water-resistant if it is stationary and under 250 metres of static water. The testing of the water-resistance is fundamentally different from non-dive watches, because every watch has to be fully tested.
1939 advertisement from Jewelers' Circular Keystone magazine of the Gallet MultiChron 30 "Clamshell", the world's first water resistant chronograph wristwatch Reverse view of the Gallet Clamshell showing the 4 screws that compress the 2 part case around the flared acrylic crystal Open view of the Gallet Clamshell showing top part of the two part case and complex Swiss column wheel movement ...
Depthomatic was another diving watch, water-resistant to 200 M, and using the ETA 2472 movement. Alertamatic was an alarm watch using the Lemania 2980 movement. Ultramatic 36000 (1975) used the rare 36,000 A/h ETA 2734 movement. Due to their close relation to Phenix/MSR, Nivada sold the Vulcain Cricket alarm watch under their brand as the Wanderer.
The Rolex Oyster Perpetual Submariner is a line of sports watches designed for diving and manufactured by Rolex, resistant to water and corrosion. [1] The first Submariner was introduced to the public in 1954 at the Basel Watch Fair. [2] It was the first watch to be waterproof up to 100 metres (330 ft). [3]