The Rolex GMT-Master II ref: 116758SARU features a 40mm case crafted from yellow gold. This model is powered by the automatic winding Caliber 3186 movement, which provides precise timekeeping. The watch displays a black dial and includes a date function, dual time zone capability, and a 24-hour indication. Its design is tailored for those who travel frequently, allowing for easy tracking of multiple time zones. The combination of materials and functionality makes it a notable piece in the Rolex lineup.