Serial Number Range: 16xxxxx-29xxxxx
General Notes: The Mark 1 or “Long E” dial was the erstwhile earliest matte dial variation before the Mark 0 was recognized. The nickname for this dial comes from the middle bar of the E in Rolex, which is much longer than on other variations and is unique to this dial.
Distinguishing Characteristics: The Mark 1 dial is very easy to pick out amongst matte dial 1675s. Look first at the coronet and then look at the E in Rolex. If the coronet is string-like and the E has a long middle bar, it is a Mark 1.
Subtypes: There are a number of changes that occur within the Mark 1.
- Hand Size:
- SN 1.6-1.8m — These usually have a flat hour hand and occasionally have the gilt-era small 24-hour hand. With the small 24-hour hand, these are referred to as Mark 0.5 dials. As it was a transitional period, however, there is no dogmatic rule about hand size/shape and the most important thing is that the lume appears to be consistent between hands and dial.
- SN 1.9-2.9m — invariably seen with curved hour hands and large 24-hour hands.
- SN 1.6-1.9m — Zinc sulfide dials were still used (a carry over from the gilt era). These appear more puffy and maintains phosphorescence when exposed to UV light.
- SN 1.9-2.9m — The lume has a waffle like texture, is more flat, and the reaction to UV light is minimal or is segregated to small crystals within the lume. The hands maintain UV consistency with the dials in both cases
- SN 1.6-1.8m — ‘thin’ cases, which were 12.7 mm thick.
- SN 1.8-2.9m — standard case, which were 13.0 mm thick.
Pictures Credit: Michael Morgan, Lee Fowler, Rolstaff of TRF