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2. Casio F-91W - Wikipedia

   en.wikipedia.org/wiki/Casio_F-91W

   The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio. Introduced in June 1989 [1] as a successor of the F-87W, [2] it is popular for its low price, long battery life and iconic design. [3] As of 2011, annual production of the watch is 3 million units, which makes it the most sold watch in the world. [4]

3. Waterproof wristlet watch - Wikipedia

   en.wikipedia.org/wiki/Waterproof_wristlet_watch

   Other requirements included a matte black dial with luminescent hands, numbers and indices, subsidiary seconds, a shatter-resistant perspex plastic crystal, a case resistant to water, dust and shock, a high-quality, isochronal and robust, 15 jewel movement, and a water-resistant winding crown of a good size. [1]

4. Water Resistant mark - Wikipedia

   en.wikipedia.org/wiki/Water_Resistant_mark

   ISO 2281 water resistance testing of a watch consists of: Resistance when immersed in water at a depth of 10 cm. Immersion of the watch in 10 cm of water for 1 hour. Resistance of operative parts. Immersion of the watch in 10 cm of water with a force of 5 N perpendicular to the crown and pusher buttons (if any) for 10 minutes. Condensation test.

5. Watch - Wikipedia

   en.wikipedia.org/wiki/Watch

   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.

6. L'impermeable - Wikipedia

   en.wikipedia.org/wiki/L'impermeable

   The watchmaker company "Alcide Droz & Sons", established in St-Imier since 1864, developed the first watch attested waterproof.They called it "L'Impermeable". They had the idea to place a seal in the crown of winder, which is screwed on the counterpart. "L'Impermeable" was born: it is the very fir

7. Gallet Clamshell - Wikipedia

   en.wikipedia.org/wiki/Gallet_Clamshell

   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 ...