Rolex Sea-Dweller

The Rolex Sea-Dweller is the brand's watch for professional deep-sea diving. Rolex developed the first model in 1967 as a deeper-rated version of the Submariner for saturation diving. Its defining feature is the helium escape valve on the side of the case: the patent was filed the same year and granted in 1970. Since 1977 the Sea-Dweller has been standard equipment for divers of the French company Comex.

The key choices are case size and generation, with cases of 40, 43 and 44 mm. At 40 mm is the steel Sea-Dweller 4000, reference 116600, with calibre 3135 and a 48-hour power reserve, produced from 2014 to 2017. At 43 mm is the steel 126600, introduced in 2017, with calibre 3235, a 70-hour power reserve and red Sea-Dweller lettering on the dial, as on the first model; the two-tone 126603 shares the same size, and both are water-resistant to 1,220 metres. At 44 mm are the Deepsea references 116660, 126660 and 136660, with a Ringlock System case rated to 3,900 metres; some have the blue gradient D-Blue dial, created to mark James Cameron's dive to the bottom of the Mariana Trench. Deepsea models also have their own collection page.

Each listing gives the reference, calibre, power reserve, water resistance, case material and size, bracelet and clasp, condition and what is included. Rolex also makes two lines with similar names, the Sky-Dweller and the Land-Dweller.