The model is a reference 1665, from 1979, so called « Great White » by collectors, with the sought-after rail dial. The elusive Rail Dial White Sea-Dweller (or “RDWSD”) is a great opportunity for the savvy collector to acquire an extremely rare variation.
With great history, remarkable evolution, rarity, the 1665 is a true icon in the world of diving’s wristwatch.
The 1665 dials with the "Rail" are quite rare nowadays since "Rail Dials" were made by the Stern Company who made the 600 meters COMEX 1665 dials and for only 2 years period. 1977-79. (Serial 5 million)
The distinctive characteristics of the rail dial are as follow:
1. The "C" of Chronometer lines up with the "C" of Certified of the line below.
2. Secondly the font of the depth markings are always in italics
3. The hour markers (tritium dots) are closer to the minute track than the regular dial
4. The only version of the SD dials where is marked "T SWISS T <25", including COMEX 1665
5. Longer minute markers.
6. Serial 5.7mil to 6.2 mil.
This example with a thick, heavy case, includes it's Rolex Service Card dated 2019 with stickers still on the watch post service.
The rail dial is superb and in flawless condition. The bracelet, being slightly later, is the 93150.
We've included a descriptive video from Watchbox below.
*Some text in the above opening description has been sourced from drsd.com