Oystersteel
Rolex uses Oystersteel for its steel watch cases. Specially developed by the brand, Oystersteel belongs to the 904L steel family, alloys most commonly used in high-technology and in the aerospace and chemical industries, where maximum resistance to corrosion is essential. Oystersteel is extremely resistant, offers an exceptional finish once polished and maintains its beauty even in the harshest environments.
Black Dial
On the black-dial version of the Explorer II, the black base of the hands blend with the dial to create a “phantom” effect in which they seem to float over the dial – a nod to the 1971 model.
The Oyster bracelet
The Oyster bracelet is a perfect alchemy of form and function, aesthetics and technology, designed to be both robust and comfortable. It is equipped with an Oysterlock folding clasp, which prevents accidental opening and the Easylink comfort extension link, also exclusive to Rolex. This ingenious system allows the wearer to increase the bracelet length by approximately 5 mm, providing additional comfort in any circumstance.
3187 Movement
The Explorer II is equipped with calibre 3187, a self-winding mechanical movement entirely developed and manufactured by Rolex. In addition to the conventional hour, minute and seconds hands, it features a 24-hour hand to display a second time zone. The 3187 is fitted with a Parachrom hairspring and Paraflex shock absorbers, offering greater resistance to shocks and to extreme conditions. Like all Rolex Perpetual movements, the 3187 is a certified Swiss chronometer, a designation reserved for high-precision watches that have successfully passed the Swiss Official Chronometer Testing Institute (COSC) tests. Its architecture, in common with all Oyster watch movements, makes it singularly reliable.
24-hour bezel
The Explorer II is equipped with an additional 24-hour display; a dedicated hand circles the dial in 24 hours rather than the usual 12, pointing to a fixed bezel with 24 hour graduations. This function enables the wearer to distinguish the hours of the day from the hours of the night, an essential feature for those who venture into environments where darkness reigns supreme – such as in the depths of caves, or where the sun never sets – like the polar regions in summer.
Specifications
- Model case
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Model caseOyster, 42 mm, Oystersteel
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Oyster architectureMonobloc middle case, screw-down case back and winding crown
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Diameter42 mm
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MaterialOystersteel
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BezelFixed, 24-hour graduated
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Winding crownScrew-down, Twinlock double waterproofness system
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CrystalScratch-resistant sapphire, Cyclops lens over the date
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Water-resistanceWaterproof to 100 metres / 330 feet
- Movement
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MovementPerpetual, mechanical, self-winding
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Calibre3187, Manufacture Rolex
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Precision-2/+2 sec/day, after casing
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FunctionsCentre hour, minute and seconds hands. 24-hour display. Second time zone with independent rapid-setting of the hour hand. Instantaneous date. Stop-seconds for precise time setting
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OscillatorParamagnetic blue Parachrom hairspring
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WindingBidirectional self-winding via Perpetual rotor
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Power reserveApproximately 48 hours
- Bracelet
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BraceletOyster, flat three-piece links
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Bracelet materialOystersteel
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ClaspFolding Oysterlock safety clasp with Easylink 5 mm comfort extension link
- Dial
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DialBlack
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DetailsHighly legible Chromalight display with long-lasting blue luminescence
- Certification
- Superlative Chronometer (COSC + Rolex certification after casing)
