Rolex GMT-Master II 40 mm 126710BLROO1 Steel Black

The Rolex GMT-Master II 126710BLROO1 is a landmark reference in the storied history of professional Rolex sports watches. As a member of the GMT-Master II family — a lineage that traces its roots to a 1955 collaboration with Pan American World Airways — this 40mm Oystersteel timepiece carries the legacy of a tool watch engineered for pilots and globetrotters who needed to track two time zones simultaneously. The 126710BLROO1 sits at the top of the modern GMT-Master II range, incorporating every refinement Rolex has made to the platform over seven decades.

The case is crafted from Oystersteel, Rolex's proprietary 904L stainless steel alloy, which offers exceptional corrosion resistance and a brilliant, long-lasting polish. At 40mm in diameter, the case strikes a balance that reads as purposefully sporty without overwhelming the wrist — a proportion that has anchored the GMT-Master II since the reference was modernized. The Oyster bracelet, with its characteristic three-piece link construction and the Oysterlock deployant clasp, provides secure, comfortable wear and the ability to fine-tune the fit with Rolex's Easylink extension system.

The black and red bidirectional 24-hour bezel insert is produced from Cerachrom, Rolex's proprietary ceramic compound. Virtually scratchproof and impervious to UV fading, this two-tone insert — which required Rolex to develop a novel kiln-firing technique to achieve two colors on a single ceramic piece — is one of the most technically ambitious bezel executions in the industry. Paired with the crisp black dial and luminous Mercedes hands, legibility in any light condition is immediate and effortless.

Powering the 126710BLROO1 is a Rolex-manufactured automatic movement, a self-winding caliber from Rolex's in-house manufacture that supports quick-set independent GMT hand adjustment, allowing the wearer to change the local hour hand without disrupting the running seconds — an essential convenience for frequent travelers crossing multiple time zones. The movement carries the Superlative Chronometer certification, reflecting Rolex's stringent in-house testing standards. Water resistance is rated to 100 meters (330 feet), making this a genuinely capable everyday companion.

On the wrist, the GMT-Master II 126710BLROO1 commands attention without demanding it. The black/red ceramic bezel has earned the nickname 'Pepsi' in certain collector circles — though that name is more traditionally applied to the blue/red bezel — and regardless of nomenclature, the color combination is unmistakably bold and immediately identifiable as GMT-Master iconography. Its versatility spans boardrooms, cockpits, and weekend wear with equal authority, which is why demand for this reference remains consistently strong in the secondary market.

Bizak & Co. presents this used Rolex GMT-Master II 126710BLROO1 as a certified authentic example, carefully inspected and sourced through trusted channels. Acquiring a pre-owned Rolex through a reputable dealer like Bizak & Co. offers collectors the opportunity to own one of horology's most enduring sports watches at compelling value. Reach out to our team at bizakandco.com to ask questions, request additional photographs, or secure this reference before it sells.