![]() The oscillator is also mounted on the Rolex-designed, patented high-performance Paraflex shock absorbers, further enhancing the movements’ shock resistance.Ĭalibre 2236 and calibre 3235 are equipped with a self-winding system via a Perpetual rotor, which ensures continuous winding of the mainspring by harnessing the movements of the wrist to provide constant energy. It is held firmly in place by a height-adjustable traversing bridge enabling very stable positioning to increase shock resistance. ![]() The oscillator of these two calibres has a balance wheel with variable inertia regulated extremely precisely via gold Microstella nuts. It is equipped with a Rolex overcoil, ensuring the calibre’s regularity in any position. In addition to resisting strong magnetic fields, this hairspring offers great stability in the face of temperature variations as well as high resistance to shocks. This movement is fitted with the blue Parachrom hairspring, manufactured by Rolex in a paramagnetic alloy. Calibre 2236 includes a paramagnetic nickel-phosphorus escape wheel.Ĭalibre 3235 incorporates the patented Chronergy escapement, made of nickel-phosphorus, which combines high energy efficiency with great dependability and is also resistant to strong magnetic fields. Its geometry, which is also patented, ensures the movement’s regularity in any position. They offer outstanding performance, particularly in terms of precision, power reserve, convenience and reliability.Ĭalibre 2236 is fitted with the patented Syloxi hairspring in silicon, manufactured by the brand. Consummate demonstrations of technology, these movements carry a number of patents. Yacht-Master models are equipped with calibre 2236 (Yacht-Master 37) or calibre 3235 (Yacht-Master 40 and Yacht-Master 42), self-winding mechanical movements entirely developed and manufactured by Rolex. These tests systematically complement the qualification testing during development and production, in order to ensure the watches’ reliability, robustness, and resistance to strong magnetic fields and to shocks. The entirely automated series of tests also checks the waterproofness, the self-winding capacity and the power reserve of 100 per cent of Rolex watches. The Superlative Chronometer certification testing is carried out after casing using state-of-the-art equipment specially developed by Rolex and according to an exclusive protocol that simulates the conditions in which a watch is actually worn and more closely represents real-life experience. The precision of a Rolex Superlative Chronometer is of the order of −2/+2 seconds per day – the rate deviation tolerated by the brand for a finished watch is significantly smaller than that accepted by COSC for official certification of the movement alone. The precision of every movement – officially certified as a chronometer by the Swiss Official Chronometer Testing Institute (COSC) – is tested a second time by Rolex after being cased, to ensure that it meets criteria that are far stricter than those of the official certification. ![]() The Superlative Chronometer status is symbolized by the green seal that comes with every Rolex watch and is coupled with an international five-year guarantee. These certification tests apply to the fully assembled watch, after casing the movement, guaranteeing superlative performance on the wrist in terms of precision, power reserve, waterproofness and self-winding. This exclusive designation attests that every watch leaving the brand’s workshops has successfully undergone a series of tests conducted by Rolex in its own laboratories and according to its own criteria. Like all Rolex watches, the Yacht-Master is covered by the Superlative Chronometer certification redefined by Rolex in 2015. THE YACHT-MASTER, SUPERLATIVE CHRONOMETER CERTIFIED
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