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2. Automatic quartz - Wikipedia

   en.wikipedia.org/wiki/Automatic_quartz

   'Seiko Quartz Automatic Generating System' (A.G.S. = early Kinetic), Perpetuum Nobile (produced in 1989), Cal. 7M45, No. 246 of 700 Seiko AGS SCUBA Diver 200m 5M23-6A60, 1993 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 ...

3. Seiko - Wikipedia

   en.wikipedia.org/wiki/Seiko

   Portrait of Kintarō Hattori, 1916. In 1881, Seiko founder Kintarō Hattori opened a watch and jewelry shop called "K. Hattori" (服部時計店) in Tokyo. [12]Kintarō Hattori had been working as clockmaker apprentice since the age of 13, with multiple stints in different watch shops, such as “Kobayashi Clock Shop”, run by an expert technician named Seijiro Sakurai; “Kameda Clock Shop ...

4. Spring Drive - Wikipedia

   en.wikipedia.org/wiki/Spring_Drive

   The Seiko Spacewalk is a limited edition Spring Drive model, designed specifically for use in space Spring Drive is a name given to a series of watch movements produced by Epson in Shiojiri . The concept of using a mainspring to power a quartz timing package was first conceived in 1977 by Yoshikazu Akahane (赤羽 好和) at Suwa Seikosha [ 1 ...

5. Deep diving - Wikipedia

   en.wikipedia.org/wiki/Deep_diving

   Deepest scuba dive on compressed air (July 1999 in Puerto Galera, Philippines). [20] 200 m (660 ft) Limit for surface light penetration sufficient for plant growth in clear water, though some visibility may be possible farther down. [nb 3] 230 m (750 ft) First dive on a hydrox-rebreather (14 February 2023 in the Pearse Resurgence, New Zealand ...

6. Master of G - Wikipedia

   en.wikipedia.org/wiki/Master_of_G

   It is specially made as a diving watch for scuba divers and is the only ISO 6425-compliant G-Shock line with a 200 m Divers rating. The first Frogman model (DW-6300) was released in November 1993. [ 22 ] [ 23 ] While Casio started to use a newer, four-screw back plate for its watches around that time, the DW-6300 retained the older screw-on ...

7. Diver propulsion vehicle - Wikipedia

   en.wikipedia.org/wiki/Diver_propulsion_vehicle

   Two U.S. Marines of the Maritime Special Purpose Force operating a Diver Propulsion Device (DPD). A diver propulsion vehicle (DPV), also known as an underwater propulsion vehicle, sea scooter, [1] underwater scooter, or swimmer delivery vehicle (SDV) by armed forces, is an item of diving equipment used by scuba divers to increase range underwater.