MK Personal Collection Men's Steel Rolex Sea-Dweller Ref 1665 Waterproof Wristwatch Circa 1975

MK Personal Collection Rare Men's Steel Rolex Sea-Dweller Ref 1665 Waterproof Wristwatch Circa 1975.  This watch has become highly collectible in the secondhand Rolex watch market and this model is 100% correct down to the bracelet. The watch features a three-body case construction, polished and brushed, helium escape valve at 9 with graduated revolving black bezel for the decompression times “trip lock” winding crown protected by the crown guard, screw-down back and crown Serial #4.410.046 Ref 1665. The watch is attached to a steel oyster bracelet #585/93105 which is the correct numbers for this series.  It has a Cal. 1570 rhodium-plated, “oeil-de-perdrix” decoration Rolex movement with 26 jewels, straight-line lever escapement, monometallic balance adjusted to 5 positions and temperature, shock absorber, self-compensating free-sprung Breguet balance spring with hack mechanism that is in running condition Serial # D791.593. It is topped with a Rolex Service black dial with white markers and date at 3:00 o'clock.  It is stamped on the inside back cover with Ref 1665. The Sea-Dweller was first developed to fulfil a narrow mission statement: survive the harsh deep-sea conditions of saturations divers. In the late 1960s, oil and gas exploration moved offshore, creating a new need for divers to go deeper than ever before and spend extended periods of time underwater, welding pipelines or installing underwater communications cables for hours at a time. The United States navy experimented with underwater habitats to prove the viability of saturation diving during SEALAB. Keeping the same reference number, it introduced a range of new features produced for a short period of 5 years, with the current example having been manufactured in 1975. The most notable difference was the replacing of red text on the dial with white writing, hence the nickname ‘Great White’, bestowed upon it by collectors. The ‘SUBMARINER 2000’ writing on the dial was also removed, clearly indicating that the Sea-Dweller would exist as its own model