GMT Master as the watch to display the second time zone in the world's first announced in 1955. In response to move the time difference between applying the know-how of the Submariner bezel, different international line pilot was born by Pan American Airways and joint development. GMT-Master in Rolex the most functional and practical, actually, for the first time, you can realize its ease of use. In the 2005 year, the 50 anniversary of the birth of the GMT-Master's significant model change. Overall improvements, has evolved significantly. Practical EasyLink feature (can be extended the length of the bracelet, 5 mm) made of the parachrom Hairspring to stabilize the ceramic セラクロムベゼル excellent corrosion resistance, scratch resistance, precision and buckle parts such as clock quality has improved significantly.