Global Functionality The GMT-Master II was created for those who cross time zones with ease. Originally designed for airline pilots, it offers a practical 24-hour display and a robust build, making it a trusted companion for international travel. The Travelling Essential This reference 16710LN features a 40mm Oystersteel case, black dial, and a rotatable 24-hour bezel. Powered by the calibre 3185 automatic movement, it offers a 48-hour power reserve and independent hour hand adjustment. The Oyster bracelet is secured with an Oysterlock clasp, delivering a timeless and functional design.