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WATER RESISTANT marking on the back of a Victorinox wristwatch. 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 ...
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 ...
The watches are tested in static or still water under 125% of the rated (water) pressure, thus a watch with a 200 m rating will be water resistant if it is stationary and under 250 m of static water. The testing of the water resistance is fundamentally different from non-dive watches, because every watch has to be fully tested.
1936: Gallet introduces the first water resistant cases for protecting the delicate mechanism of chronograph wristwatches from the damaging effects of humidity. [10] This innovation become standard on many models in Gallet's "MultiChron" line of professional use timepieces, as well as the upcoming Flight Officer military issue pilot's watch.
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.
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.