Rolex GMT-Master

The Rolex GMT Master was developed by Pan Am Airlines for airline pilots in the 1950's. This model was the first to introduce the "dual time zone" feature, which was designed to reduce the impact of jet lag. The original 1955 model (reference 6542) had a graduated disc with two colors: red for daytime and blue for nighttime. The second time zone is read with a triangular hand that makes a full 24-hour revolution. This model was mostly made of steel, although there are also yellow gold variants that have different details. The Rolex GMT Master 16700 has a 40mm case and features a Caliber 3175. This reference was only available with blue and red bezel inserts, also called "Pepsi", or with full black inserts. In addition, this model is water resistant up to 100 meters.