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2. Citizen Watch - Wikipedia

   en.wikipedia.org/wiki/Citizen_Watch

   Citizen Promaster Automatic NY0040-09EE diving watch. In 1959, Citizen launched the Parawater – Japan's first fully-waterproof wristwatch. It became the forerunner to Citizen's range of dive watches, subsequently (1982) called the Promaster Marine range. Also in 1982, Citizen launched the 1300m Professional Diver's watch – the world's most ...

3. Eco-Drive - Wikipedia

   en.wikipedia.org/wiki/Eco-Drive

   Citizen also built an automatic quartz powered watch, the Citizen Promaster Eco-Duo Drive (released in December 1998). [26] Novel to this watch was the use of both mechanical power as well as a solar cell to power the electronic movement and charge the secondary power cell.

4. Automatic quartz - Wikipedia

   en.wikipedia.org/wiki/Automatic_quartz

   Automatic quartz is a collective term describing watch movements that combine a self-winding rotor mechanism [1] (as used in automatic mechanical watches) to generate electricity with a piezoelectric quartz crystal as its timing element. Such movements aim to provide the advantages of quartz without the inconvenience and environmental impact of ...

5. Diving watch - Wikipedia

   en.wikipedia.org/wiki/Diving_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 ...

6. Miyota (watch movement manufacturer) - Wikipedia

   en.wikipedia.org/wiki/Miyota_(watch_movement...

   Miyota produces various 'standard' and 'premium' grade mechanical movements for automatic wristwatches.. The Miyota 8215 is an entry level non-hacking-earlier versions twenty-one jewel three-hand with date automatic wristwatch movement with a uni-directional winding system (left rotation) with an accuracy of -20 to +40 seconds per day, and a power reserve of over 40 hours.

7. Watch - Wikipedia

   en.wikipedia.org/wiki/Watch

   Diver's 100 m and 150 m watches are generally old(er) watches. Diver's 200 m or 300 m: Suitable for scuba diving at depths not requiring helium gas. Typical ratings for contemporary diver's watches. Diver's 300 + m helium safe: Suitable for saturation diving (helium-enriched environment). Watches designed for helium mixed-gas diving will have ...