The 1950s rolex GMT 6542 has its history with Pan-Am, where it commissioned a watch to be designed with specification, enbling the pilots to keep track of time in two locations. It has an additional hour hand that revolved once every 24 hours and a rotating bazel. The watch was designed by Captain Frederic Libby and Rene-al Jeanneret.
The Rolex 6542 was produced from 1954 to 1960 with distinct mercedes hands, and a transparent acrylic insert bezel (material chosen to cut down reflectivity for better legibility) as well as its distintiive feature of not having the crown guard (similar to the eraly James Bond submariners 6500, 6502, 6504, 6536, 6538, 5508 and 5520).
The Ref 6542 was later replaced by Red 1675, 16750 with the crown shoulder guard. The Rolex GMT was often known as the "Pepsi" bezel owing to the similiarity of colours!For those who is keen to get one can visit: