The Rolex GMT-Master II is more than just a watch; it's a legend. Its iconic status is cemented not only by its instantly recognizable design but also by the robust and reliable movement that powers its dual-time functionality. This review will delve deep into the heart of the GMT-Master II, exploring its movement, various models, and key specifications, particularly focusing on the popular BLNR reference (116710BLNR). We'll also cover pricing and sizing aspects to provide a comprehensive overview for potential buyers.
Rolex GMT Master II BLNR Specifications: A Starting Point
Before embarking on a detailed exploration of the movement, let's establish a baseline with the specifications of the Rolex GMT-Master II BLNR (Batman), a highly sought-after model:
* Reference: 116710BLNR
* Case: Oyster, 40mm, 904L steel
* Bezel: Bidirectional rotatable 24-hour graduated bezel. Two-colour blue and black Cerachrom insert.
* Movement: Calibre 3186 (we'll delve into this extensively below)
* Crystal: Scratch-resistant sapphire crystal with cyclops lens over the date.
* Water Resistance: 100 meters (330 feet)
The Calibre 3186: The Engine of the GMT-Master II
The heart of the GMT-Master II BLNR, and many other modern GMT-Master II models, is the Calibre 3186. This is a self-winding mechanical movement, a testament to Rolex's commitment to horological excellence. Its features are critical to the watch's functionality and reputation:
* Chronometer Certification: The Calibre 3186 is a Superlative Chronometer, certified by COSC (Contrôle Officiel Suisse des Chronomètres). This rigorous testing ensures exceptional accuracy and precision, typically within -2/+2 seconds per day. This certification is a hallmark of Rolex's dedication to quality.
* Self-Winding Mechanism: The movement utilizes a highly efficient self-winding system, powered by the rotor's movement as the wearer's wrist moves. This eliminates the need for manual winding, providing continuous power.
* Paramagnetic Blue Parachrom Hairspring: This innovative hairspring is a key component in the movement's accuracy and resistance to shocks and magnetic fields. The blue Parachrom hairspring is significantly more resistant to shocks than traditional hairsprings, contributing to the watch's reliability. Its paramagnetic properties further protect it from the effects of magnetic fields, a common concern in today's world filled with electronic devices.
* High-Performance Escapement: The escapement is the mechanism that regulates the release of energy from the mainspring, controlling the rate at which the watch runs. Rolex's high-performance escapement contributes to the movement's precision and stability.
* Power Reserve: The Calibre 3186 offers a power reserve of approximately 50 hours. This means the watch will continue to run for two days without being worn, offering convenience and practicality.
* Independent Hour Hand: This is arguably the most crucial feature of the GMT-Master II movement. The independently adjustable hour hand allows the wearer to track a second time zone simultaneously with local time. This is accomplished through the bidirectional bezel, which allows for the adjustment of the 24-hour hand.
* Date Display: A date window at 3 o'clock provides a practical calendar function.
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