TWINLOCK WINDING CROWN
The Twinlock system guarantees that the screw-down winding crown is perfectly water-resistant thanks to two sealed zones, one inside the tube, the other inside the crown. This principle is used on all the watches in the Oyster collection that are guaranteed waterproof to 100 metres (330 feet).
To protect the winding crown – the only external mobile element of the watch – the case of the Explorer II is machined with an integral crown guard.
A scratch-proof sapphire crystal, a clear dial and special luminescent markings allow the rugged Rolex Explorer II to be read even in the most challenging conditions.
Night and Day
The high-contrast Chromalight display on the dial innovates by pushing the boundaries of visibility in dark environments. The blue glow of the hour markers and hands lasts up to eight hours with a uniform luminosity throughout, practically twice as long as that of standard luminescent materials.
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 situation.
Rolex uses 904L stainless steel for its steel watch cases. 904L is mainly used in the high technology, aerospace and chemical industries, where maximum resistance to corrosion is essential. A superalloy, 904L is extremely resistant and highly polishable.
It maintains its beauty even in the harshest environments. 904L steel also provides a perfect complement to the precious metals used by Rolex.
To increase the resistance of its movements to shocks – especially if the watch is dropped – Rolex developed Paraflex, a highly efficient shock absorber designed to protect sensitive components of the movement, notably the staff of the balance wheel. Paraflex shock absorbers increase shock resistance by up to 50 per cent.
Certified Swiss Chronometer
The four simple words Superlative Chronometer Officially Certified on a Rolex watch dial mean that the very movement inside the timepiece has endured 15 days and nights of testing by COSC (Contrôle Officiel Suisse des Chronomètres – Swiss Official Chronometer Testing Institute), an independent not-for-profit association. To receive COSC certification as a Swiss chronometer, a watch must demonstrate extreme precision in a variety of positions and temperatures. Rolex is unique in the industry: this is the standard level of quality required of every Rolex wristwatch movement.