Notes: This was the first GMT Master. It was launched 1954. It was developed on the basis of a regular Turn-O-Graph (Ref. 6202). The modifications were a different bezel and a modified movement. This first version of the Ref. 6542 had a bakelite bezel insert. As this bezel was likely to crack, it got replaced by a metal bezel in 1956. The bakelite bezel was luminous. The name Pussy Galore originates from a character in a James Bond movie, wearing this watch.

Mechanism: Rolex did not make the cal.1066 movement with the butterfly rotor for very long and as a result parts can be very hard to come by. The butterfly rotor movement was possibly one of the shortest production Rolex movements. It was introduced in mid 50s and was out of production by the very late 50s. The movement was also used in the GMT Master which is a much more valuable watch so owners tend to buy these up for spare parts.

Technical specifications for this movement have proven very difficult to obtain.