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 610 metres (2,000 ft) and its Rolex reference reference number was 1665. Most Sea-Dweller watches incorporate a helium escape valve for saturation diving. Early Sea-Dwellers did however not always have the helium escape valve. Another feature setting it apart is the absence of a date magnification bubble, the cyclop, present on most Rolexes. Since 1977 the Rolex Sea-Dweller diving watch range have served as standard issue diving watches for Comex divers. 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.[1][2][3] 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 1,220 metres (4,000 ft). The last Comex Sea-Dweller 4000 Rolex reference number is 16600 and this watch was issued to Comex divers since 1992. Rolex Sea Dweller watches are very famous for its underwater diving depth rating of 610 metres. And the replica Rolex Sea Dweller watches are the first choice for any divers. Someone who loves the Rolex Sea Dweller watches, even in the form of a fake Rolex watch, cannot be a common individual.Have your own Sea Dweller watches today!