Steel case on a leather bracelet, oyster, black mat "Mark I" "Long E" "Swiss T < 25" dial, patina indexes, "Pepsi" blue and red bezel, plexi glass, screw-in crown, automatic certified chronometer movement (COSC), 1570 caliber.
The GMT-Master was developed to meet the specific needs of airline pilots. It became the official watch of several airlines, among them the famous Pan American World Airways, better known as Pan Am. Its most distinguishing visual feature was the two-tone bezel which marked daytime from nighttime hours.
THE FIRST TRANSCONTINENTAL FLIGHTS
As intercontinental travel developed in the 1950s, airliners began to fly swiftly across several successive time zones. For the first time it became important to know the time in various places in the world, simultaneously. It was the dawn of the jet age, and Rolex responded with a watch to match the spirit of the times.
