οκ η επιλογη μου ηταν το ρολεξ ,γιατι το θεωρω ενα κομματι της ιστοριας της ωρολογοποιιας και οχι μονο....
History
During the 1960s, commercial work in the oceans and seas created professional diving organisations that needed tool watches designed for conducting safe diving operations at greater depths - known as saturation diving. This led to the development of the first 'ultra water resistant' watches.
The Sea-Dweller's integrated helium escape valve
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. 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 have 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 (2000 ft = 610 m) models where succeeded by the Rolex Oyster Perpetual Sea-Dweller 4000 (4000 ft = 1220 m) model with an increased depth rating. The current Comex Sea-Dweller 4000 Rolex reference number is 16600 and this watch has been issued to Comex divers since 1992.
wikipedia