Rolex GMT-Master II 40 mm 126710BLNROY Steel Black Rolex GMT-Master II 40 mm 126710BLNROY Steel…

The Rolex GMT-Master II is one of the most celebrated tool watches ever produced, and the 126710BLNROY — affectionately known as the "Batman" among collectors — represents the pinnacle of that legacy. The GMT-Master II combines a travel-focused second-time-zone display with a versatile sports-watch design. This reference uses Rolex’s self-winding calibre 3285 and pairs a black dial and blue-and-black bezel with an Oyster bracelet.

At 40mm in Oystersteel — Rolex's proprietary 904L stainless steel alloy prized for its corrosion resistance and polished finish — the case offers a versatile size for daily wear. The Oyster bracelet is secured by an Oysterlock safety clasp.

The defining visual signature of this version is its blue-and-black Cerachrom ceramic bezel insert, paired with a black dial and luminous hands and hour markers. The bidirectional bezel has a 24-hour scale and works with the additional 24-hour hand to indicate reference time.

Powering the 126710BLNROY is a Rolex automatic movement regulated as a Superlative Chronometer, a designation that means each watch is certified by Rolex to a precision standard of -2/+2 seconds per day — significantly tighter than the standard COSC chronometer benchmark. The movement incorporates a paramagnetic blue Parachrom hairspring for exceptional resistance to magnetic fields and shocks, and a Chronergy escapement engineered for improved efficiency and reliability. The local hour hand can be adjusted independently in one-hour steps without stopping the minute and seconds hands, while the additional 24-hour hand indicates reference time.