Designed to show the time in two different time zones simultaneously, the GMT-Master, launched in 1955, was originally developed as a navigation instrument for professionals criss-crossing the globe. Heir to the original model, the Oyster Perpetual GMT-Master II was unveiled in 1982, with a new movement ensuring ease of use. Its combination of peerless functionality, robustness and instantly recognizable aesthetics has attracted a wider audience of world travellers.