Serial Number Range: 55xxxxx – 59xxxxx
General Notes: This dial is most commonly seen as a service dial for earlier 1675s that were serviced in the middle to late 70’s and early 80’s; it used to be referred to as the “Mark X” because it was thought to only be a service dial. Conventional wisdom is now that is was also likely used as a production dial toward the very end of the 1675 model line. If you’re looking for an “original” 1675 and the watch has this dial, be sure that the serial is very late in production, otherwise it’s a service dial.
- The Mark 6 has the tallest coronet of any matte dial 1675 and is the easiest way to recognize a Mark 6. Compared to the Mark 5, which has the most similar coronet, the base of the Mark 6 is also more circular and small.
- The serifs of the ‘Rolex’ text are not sharp angles on the L and E but are smoothed curves.
- The ‘Oyster’ and ‘Perpetual’ words are spaced closer than the other dials and lack significant serifs.
- The lower text is best differentiated by it’s smooth G of GMT (which lacks the extra vertical line on the lower right) and the O of officially, which runs slightly lower than the rest of the SCOC text.