Global Companion The GMT-Master II was designed for international travellers and aviation professionals, offering dual time zone functionality with a distinctive 24-hour bezel. Its bold aesthetic and technical prowess have made it a favourite among explorers and professionals alike. Dual Time Mastery This 2015 model features a black dial and rotatable black 24-hour bezel, housed in a 40mm case of Oystersteel and yellow gold. The Oyster bracelet includes Easylink and Oysterlock for secure wear. Powered by the 3186 calibre, it maintains approximately 48 hours of power.