The case back, edged with fine fluting, is hermetically screwed down with a special tool that grants only Rolex watchmakers access to the movement. The middle case is crafted from a solid block of Oystersteel. The Explorer’s Oyster case, 36 mm or 40 mm in diameter and guaranteed waterproof to a depth of 100 metres (330 feet), is a paragon of robustness and reliability. THE OYSTER CASE, SYMBOL OF WATERPROOFNESS These tests systematically complement the qualification testing upstream 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 Explorer is covered by the Superlative Chronometer certification redefined by Rolex in 2015. THE EXPLORER, SUPERLATIVE CHRONOMETER CERTIFIED Even in the dark, the dial is easy to read thanks to the Chromalight display: the index hour markers, hands and emblematic 3, 6, 9 numerals are filled or coated with a luminescent material emitting a long-lasting blue glow – for up to two times longer than traditional phosphorescent materials. The sleek black lacquer high-contrast dial offers excellent legibility in all circumstances. As of 2023, this exploration tool is also available in a 40 mm version. In 2021, the watch returned to the size of the original model launched in 1953: its redesigned case, fitted on a resized bracelet, took on a 36 mm diameter once more, after having been increased to 39 mm in 2010. The feedback that Rolex received from the members of these different expeditions therefore had a direct influence on the evolution of its watches, making them more precise and robust.Īs it has evolved, the Explorer has progressively incorporated Rolex’s technological innovations, such as the Parachrom hairspring and high-performance Paraflex shock absorbers. This pioneering move illustrated the company’s ambition to use the world as a laboratory, testing its watches in real conditions in order to continually improve them. In the 1930s, the brand began to equip numerous Himalayan expeditions with Oyster watches. The Explorer is emblematic of the close ties between Rolex and exploration.
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