ROLEX DEEPSEA SEA-DWELLER. FULL SET from Qatar

A ROLEX MEN'S AUTOMATIC STAINLESS STEEL DIVER'S BRACELET WATCH. FULL SET from Qatar Model: Deepsea Sea-Dweller 12800 ft=3900 m Date: 15/02/2010 Case reference: 116660 Movement: Signed, automatic Dial: Signed, black, silvered applied hour markers with super-luminova applied, silvered Mercedes hands with super-luminova applied, silvered centre seconds hand with super-luminova applied, white outer minute division, date aperture at the three o'clock position with a white calendar disk and black Arabic numerals Case: Signed, stainless steel, uni-directional stainless steel bezel with black ceramic bezel, original gas escape valve at the nine o'clock position, screw-down crown, screw-down back Bracelet: Signed, stainless steel, signed stainless steel deployment clasp Size: 44mm Accompaniments: Rolex box, Rolex tags, and paperwork from Qatar During the 1960s deep sea divers started working at deeper and deeper depths and for longer periods of time. Due to these change in their working conditions, they started having problems when using the Rolex Submariner 5513. As divers were routinely going deeper under water and being subject to greater pressures, consequently greater were the amounts of dangerous gases that would build up in their bodies. This meant that they required more time to depressurise - that is, to allow their bodies to safely release and re-absorb those gases - before they could return to normal surface atmospheric pressures. This is done using a special nmix of gases in a special depressurisation chamber at the surface, to allow them to return to normal amospoheric pressure. To save time between dives, and so avoiding having to take the time to depressurise completely during their working hours, divers are placed in special pressuriesd containers breathing a Helium-Oxygen mix instead of plain air, which allows the re-balancing of gases in the body to take place in comfort, as helium is released by the body faster. Thus, less time is required for them to decompress by other method and in this way, they just had to decompress once, at the very end of the diving time, increasing the time they could spend working. During that time the divers were breathing the Helium-Oxygen mix in the pressurized chamber theoir eatches were affected by the high poresence of helium - the helium molecules started to penetrate the acrylic crystal of the watch and at the very end of the work period, when the divers were finally brought back to normal atmospheric pressure the pressure inside the watch pushed the crystal out, destroying the watch. Compagnie Maritime d’Expertises– better known as COMEX (a French deep-sea diving company) asked Rolex to find a solution to releasing the pressure inside the watch and, in 1967, the first gas escape valve was patented. In 1967 the new Rolex Sea-Dweller model 1665 was fitted with thicker lenses, which enabled the watch to perform at a depth of up to 610 meters (2000 feet), as well as featuring a Submariner case, and a very high-standing bezel. Later that year a thicker case was introduced, and on the back of the case 1665, you can read 'Patent Pending' instead of 'Patented', as can be seen on later examples. The first Sea-Dwellers feature on the dial in red print 'Submariner Sea Dweller 2000'. This particular styling was used lonly during the first six years of productiuon, to be later replaced with an all-white print dial that carried only 'Sea-Dweller'. All of Comex's saturation divers were issued with a 1665 case, white dial print Sea-Dweller - which displayed the Comex logo on it instead of the word Sea-Dweller. Comex's divers achieved many world records using these Rolex watches until the 1990's when both companies finished their collaboration.Click here to share: