Pre-owned Rolex GMT-Master II ref 16713 (1991) traces its roots back to the original GMT-Master introduced in the 1950s, a watch developed with Pan Am pilots who needed a simple way to track multiple time zones during long international flights. In the early 1980s, Rolex evolved the concept with the GMT-Master II, allowing the 24-hour hand to be set independently from the main hour hand. That upgrade made it far more practical for travelers, since you could adjust the local time without stopping the watch. Ref. 16713 is a two-tone version of the model, pairing stainless steel with yellow gold. This example features a black dial with luminescent hour markers and Mercedes-style hands, along with an all-black aluminum bezel with gold 24-hour graduations. The bezel works together with the additional 24-hour hand to track a second time zone at a glance. Shop Rolex GMT-Master II Collection