The Rolex Oyster Perpetual Date GMT Master is part of the Rolex Professional Watch Collection. It is one of the most iconic models in the Rolex collection, regarded as a status symbol and is popular with travelers and people who need to keep track of the time simultaneously in different areas of the world.
The Rolex GMT Master can display time in two different time zones and the Rolex GMT Master II in three. Using the additional GMT hand (which completes a 24 hour cycle in a single rotation) the GMT Master and the GMT Master II uses a bi-directional rotatable bezel marked zero to twenty three allowing for a second time zone to be displayed with the GMT hand pointing to the bezel hour.
The GMT Master II allows the hour hand to be set independently from the GMT hand, thus allowing a third time zone.