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The Rolex Oyster Perpetual Date Sea-Dweller is a line of diver's watches manufactured by Rolex, with an underwater diving depth rating of for the vintage models and up to 3,900 metres (12,800 ft) for the most recent Sea-Dweller DEEPSEA model. ==History== During the 1960s, the needs of professional divers working at great depths led to the development of the first 'ultra water resistant' tool watches designed for conducting safe diving operations at 300 m+ (1,000 ft+) depths. The Rolex Oyster Perpetual Sea-Dweller Submariner 2000 (2000 ft = 610 m) that became available in 1967 was developed from the Submariner for the Comex S.A. industrial deep-sea diving company by increasing crystal thickness and was produced in several variations. It had a depth rating of and its Rolex reference number was 1665. Most Sea-Dweller watches incorporate a helium escape valve for saturation diving. Early Sea-Dwellers did not always have the helium escape valve. The model is also distinguished by the absence of the date magnifier ("cyclops") present on most other Rolex models. The Sea-Dweller diving watch range has been standard issue for Comex divers since 1977. The Sea-Dweller Submariner 2000 watches had 2 red text lines on the watch dial which led to an unofficial "Double Red" designation under watch collectors for these watches.〔(Rolex "Double Red" Sea-Dweller Submariner 2000 )〕〔(Dials of the Double Red )〕〔(Rolex Double Red Sea Dweller with the Patent Pending Caseback by Delgado )〕 The Sea-Dweller Submariner 2000 models were succeeded by the Rolex Oyster Perpetual Sea-Dweller 4000 (4000 ft = 1220 m) model with an increased depth rating to . The last Comex Sea-Dweller 4000 Rolex reference number is 16600 and this watch was issued to Comex divers since 1992. Several semi custom production runs of Sea-Dweller Submariner 2000 and 4000 models were produced with and without helium escape valves and differing watch dial patterns for the Comex S.A. company. These variants sometimes also had differing Rolex reference numbers. Some of these non standard Sea-Dweller watches had the Comex S.A. logo depicted on the watch dail which led to an unofficial "COMEX watches" designation under watch collectors for these watches. These watches were either issued to actual Comex staff members or served as gifts for business relations.〔(COMEX Watches by Delgado )〕〔(The Rolex ref.1665 Patent Pending Sea-Dweller )〕 At the BaselWorld watch and jewellery show 2008, Rolex introduced an updated Sea-Dweller model, named the Rolex Oyster Perpetual Date Sea-Dweller DEEPSEA. Its reference number is 116660. With an official depth rating of , the Sea-Dweller DEEPSEA represented in its launch year the most water resistant mechanical watch in serial production. For obtaining this official depth rating the Sea-Dweller DEEPSEA water resistance is tested to a depth of to offer the 25% safety reserve required by the ISO 6425 divers' watches standard.〔(Rolex Sea-Dweller DEEPSEA by rruegger ) 〕 To test the water resistance of the Sea-Dweller DEEPSEA, Rolex uses testing equipment developed for them by Comex. Normal surface air filled watch cases and crystals designed for extreme depths must be dimensionally large to cope with the encountered water pressure. To obtain its water resistance the Rolex Sea-Dweller DEEPSEA watch case has a diameter of mm, thickness of (domed crystal thickness ) and the case and bracelet weigh .〔(The deep dive watch The Rolex DEEPSEA brochure )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rolex Sea Dweller」の詳細全文を読む スポンサード リンク
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