1967 Tropical Dial Rolex Double Red Sea Dweller 1665 "Thin Case" with Mk II

Rolex Seadweller Comex ad

(Co-Branded DRSD Comex/Rolex AD c. 1970's)

In the early part of the 1960's deep sea diving and in particular mixed gas diving was advancing. The Submariner became the quintessential diver born out of the late 1950's, with its iconic design which set the standard for almost all dive watches to come thereafter until its launch in 1953. The Rolex SeaDweller was born in the 1960s out of the collaboration with COMEX a French deep sea diving company. Comex is sometimes referred to as the NASA of the deep seas and was the pioneer in mixed gas diving.

In typical Rolex fashion meaning form following function, most of the SeaDwellers design was born out of the need to comply with the commercial ISO 6425 diving standard, which defines test standards and features for watches suitable for diving with underwater breathing apparatus in depths of 100 m (330 ft) or more. 

Saturation diving requires the use of helium in the breathing gas mixture, and helium particles would accumulate within the case of a diving watch during prolonged exposure meaning long deep dives and or at depths greater than 200 meters/660 feet where mixed brining gas was essential. During the early days of deep saturation diving, a strange phenomenon was arising during the decompression of these dives in which the pressure inside the watch would build as a result of helium gas being trapped in the cases of the watches that were being used. The weakest point of the watch at the time was the crystal and upon decompression from the dives, the helium gas would expand, ejecting the plexiglass crystal as that helium gas forced its way outward. Being that watches back then were crucial tools for timing decompression and other important events this was a major flaw that needed to be fixed. Rolex developed a rather simple and practical mechanism to solve this issue by developing a helium escape valve on the side of the case that allowed the helium particles escape while still maintaining an ISO 6425 diving standard and water resistance rating.

Founder Of COMEX, Henri Delauze [1970](Founder Of COMEX, Henri Delauze c. 1970)


The new model of Submariner was created was dubbed the reference 1665, based on the existing Submariner model with some major upgrades. Initial prototype models were exclusively issued to DeepSea Explorers of the 1960s in various configurations but in the late 1960 and early 1970s, the model made it to the Rolex retail stores.  The Double Red Sea-Dweller (DRSD) was produced for approximately 10 yrs starting in 1967 to 1977 There were four different dial variations made in the regular production model with three different case back configurations. Post 5.1 million serial number ref. 1665 Sea-Dwellers can be seen only bearing white text and have earned the nickname, "great white" Sea-Dweller.

Rolex Seadweller 1665 MK2 dial

The MK II double Red Seadweller dial possesses the following key characteristics

  • The coronet spikes are distorted and the "O" under it is almost nonexistent.
  • open 6's in the depth rating
  • The second line of red text (Submariner 2000) is smaller than the first line of red text
  • The red text is directly applied on to the dial and is a bright red and crisp

The Sea-Dweller is undoubtedly the most advanced amongst the diving watches of its time. Featuring a bidirectional bezel, a tropic super domed bezel to withstand greater pressure, and date complication. Fully certified and guaranteed waterproof to 2000ft - 610m. 

Stock # RLXDRSD1665-68TR
Brand Rolex
Style "Thin Case" Double Red Sea-Dweller
Model 1665
Serial 17XXXXX
Size Men's
Material SS
Dial Tropical Matte (MK 2)
Millimeters 40
Bracelet Rolex Oyster 93150 Flip Lock 585 Ends



Excellent case that has been polished and shows very light wear from use. 
The bezel insert has taken on a wonderful copper brown ghost-like fade coloration and the pearl remains intact at the 12 o'clock position. The case back reflects the last 3 digits of the case serial number as is correct for an original Rolex SeaDweller ref. 1665 of this specific era. The Rolex Oyster 9315o Flip Lock 585 ends with very minimal wear from light use


Flawless Mark II Double Red Sea Dweller dial which has taken on a wonderful tobacco brown "tropical" coloration The dial is free of any scratches and or blemishes and the minute track and edge of the dial remain complete without any chipping or issues sometimes seen in DRSD dial variants. The tritium lume plots have achieved a wonderful creamy patina. When viewed under U.V. light the lume plots show consistent texture displaying no lume degradation or issues. The hands have been previously color matched to the dial. The original silver date disk displays the correct open 6 and 9's. 


None, The watch was just recently serviced and is keeping time within COSC spec backed by a 1-year warranty on accurate timekeeping.