Rolex Explorer II

Introduced in the early 1970's as model 1655, it is in essence a GMT Master with a fixed bezel. It has the same calibre movement as the GMT (1575) and has a forth hand which rotates once every 24 hours. This hand was read using the 24 hour engraved steel fixed bezel

Rolex introduced the watch as an essential tool to all 'speleologists' (more commonly known as 'cave explorers' ) Rolex also claimed that the speleologist "soon loses all notion of time: morning, afternoon day or night." For these intrepid souls Rolex developed the watch that could tell them whether the "2" on the dial was 2:00 a.m. or 2:00 p.m. (14:00). This may well be true, but there are other things with a higher demand than speleologists. The limited popularity that it had was because of people in the aviation field, air traffic controllers, etc. In its life the watch for the first 3 years had an orange hand, and up until 1985 it had a red one. The 1655 Explorer II and the 1019 Milgauss are the only Rolex Models which use hands that are not used by any other model.