Rolex uses 904L stainless steel for steel watch cases. The 904L is generally used in high-tech, aerospace and chemical industries where maximum durability against wear and tear is extremely important. A superalloy, the 904L is extremely resistant and can be very polished. Maintain beauty even in the harshest environments. The dial is the original face responsible for the identity and readability of a Rolex watch. All of the Rolex dials, which are characterized by clock ticks shaped from 18 kt below to prevent blackening, are designed and produced in Rolex, mostly by hand to provide perfection. Designed for both durability and comfort, the Oyster bracelet is a perfect complement to shape and function, aesthetics and technology. It is equipped with an Oysterlock folding clasp to prevent accidental opening and a special Easylink comfort extension connection to Rolex again. This sophisticated system allows the wearer to increase the length of the bracelet by approximately 5 mm, providing extra comfort in any situation. The GMT-Master II is equipped with a caliber 3186, a mechanical clock mechanism developed and manufactured entirely by Rolex, with an automatic setup. In addition to the traditional scorpion, minute hand and seconds arm, it contains a 24-hour hand to display the second time zone. Like all Rolex Perpetual mechanics, the 3186 also has a Swiss chronometer certificate awarded to high precision wristwatches that pass the Swiss Official Chronometer Test Institute (COSC) tests successfully. The 3186 is equipped with a Parachrom balance spring that is more resistant to shocks and temperature changes. Just as in all Oyster clocks, the architecture makes this mechanism uniquely reliable.
Cyclops lens, sapphire glass. Water resistant up to 100 meters. 40 mm case diameter. 3186 Rolex Caliber. Mechanical movement. Oyster bracelet. 904L Steel. 48-hour power reserve.