The Rolex GMT-Master II reference 126710BLNR — universally known as the "Batgirl" — is the definitive modern iteration of one of horology's most celebrated travel watches. Introduced in 2019, it brought the iconic black and blue Cerachrom bezel combination to the Jubilee bracelet for the first time, and in doing so created what has become the most sought-after configuration in the current GMT-Master II lineup.

The 40mm Oystersteel case houses the calibre 3285 — Rolex's most advanced GMT movement, featuring the Chronergy escapement for improved efficiency, a Parachrom hairspring for enhanced resistance to shocks and magnetic fields, and a 70-hour power reserve. The independently adjustable GMT hand allows a second time zone to be set without disturbing the running seconds, while the bidirectional rotating bezel provides a third reference point for the well-travelled wearer. The watch is certified as a Superlative Chronometer to +/-2 seconds per day.

The black dial is a model of functional clarity — applied white gold hour markers and Mercedes hands carry Chromalight luminescence, the date window at three o'clock sits beneath a Cyclops lens, and the overall composition delivers the immediate legibility that professional tool watches demand. The blue and black Cerachrom bezel insert is virtually scratch-proof and UV-resistant, retaining its colour and definition indefinitely.

The five-piece Jubilee bracelet — returning to the GMT-Master II for the first time since the steel bezel era — elevates the wearing experience considerably, sitting closer to the wrist and moving with a fluidity that the Oyster bracelet, for all its credentials, cannot match. The Oysterlock clasp with 5mm Easylink extension completes the package.

The "Batgirl" is the GMT-Master II for those who know exactly what they want — the right bracelet, the right bezel, the right movement, in the right steel.