The Rolex Sky-Dweller is the brand's most complicated timepiece, combining Rolex's first annual calendar complication, with a dual-time function. Equipped with the Ring Command Bezel, the wearer can accurately sync the watch with the starting sequence of a yacht race. In 2007, the Rolex Yacht-Master II was launched, this time as a professional regatta watch that can also be used as a chronograph. The Rolex Yacht-Master was introduced in the 1990s as a luxurious nautically-themed watch, aimed at yachting enthusiasts. The Sea-Dweller today has a depth rating of 1,220 meters (4,000 feet), while the Deepsea Sea-Dweller can go to depths of up to 3,900 meters (12,800 feet). The addition of the helium escape valve let helium particles flow out safely from the watch, allowing divers to stay underwater for longer periods. While Rolex had a very capable dive watch in the Submariner, the Sea-Dweller was developed for extreme depths and longer periods underwater. Rolex launched the first iteration of the Sea-Dweller in 1967. It was designed to meet the demands of scientists, doctors, and engineers for a timepiece that won't be damaged when exposed to magnetism. ROLEX MILGAUSS (1956)Ĭreated in 1956, the Milgauss (from French mille meaning thousand, and gauss the unit of magnetic field strength) was built to withstand magnetic fields of up to 1,000 gauss. The second edition of the Rolex Explorer was equipped with a larger case, a 24-hour bezel, and a luminous 24-hour hand to help spelunkers and cave explorers to tell the difference between daytime and nighttime hours. The characteristic black dial, large hour markers, and contrasting 3-6-9 numerals were made to equip mountaineering and polar expeditions.

The first Rolex Explorer was introduced to commemorate the pioneering climb to Mt. It features large 3-6-9 markers, and a prominent minute scale for navigational time readings. The Rolex Air-King was introduced as part of a group of watches designed by the company for the British Air Force and its pilots.

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