All Single Red Sea-Dwellers, side-by-side

Rolex Single Red Sea-Dwellers do not require an introduction, do they? These particular watches with the rare 500 metres denomination on the dials are without doubt the horological super bad boys of professional diving. Some of these watches were present when a handful daring adventurers fullfilled their dream of becoming free agents of the sea in the late 1960s.

Rolex Sea-Dweller Ref. 1665 “Single Red”

The name Sea-Dweller was directly derived from the activity of the Aquanauts: “dwelling” at the bottom of the sea. Sometimes for days, weeks or even months. Diving was no longer just an enjoyment for an hour or two. The Aquanauts, pressurized to the same pressure as their underwater environment, could go in and out of their habitat through an open hatch, just as they pleased. Decompression after each dive was not required. The prolonged duration of these programs might be one of the reasons why Rolex decided to equip the Sea-Dweller with a date complication. The Aquanauts needed to know which day it was. Having a date on a diving watch was apparently such big deal for Rolex, they even had the word “Date” printed in a larger font to highlight this feature.

Illustration of the SEALAB 3 habitat at a depth of 100 fathoms (600 ft/185 m), together with the pressure capsule to transfer the Aquanauts to and from the ocean floor


Most of these early Sea-Dwellers don’t have a gas escape valve, the very feature which makes a Sea-Dweller ultimatelly a Sea-Dweller. The gas escape valve was only necessary when living in a helium saturated environment, in order to prevent the watch from damage during decompression. Tektite 1 for instance, did not require the helium valve at all, since the gas mixture breathed by the Aquanauts consisted only of nitrogen and oxygen due to the shallow environment (50 ft/15 m).

Tektite 2


Single Red Sea-Dwellers are exceptionally rare. T. Walker Lloyd, an Oceanographic Consultant of Rolex and a diver himself, personally handpicked professional divers who would receive these watches for testing purposes or as awards. Mr. Lloyd got the job at Rolex after sending a summary of Bob Barth’s conception of the one-way helium valve. Bob Barth is a former US Navy Aquanaut.

Read more: The history of the Rolex Sea-Dweller at a glance

Some sources claim there are 5 specimen of the Single Red Sea-Dweller, others say 6. I like it precise, so I did my home work, built a comprehensive Sea-Dweller database and tracked down every Single Red Sea-Dweller I could find.

There are at least 11 different specimen. 12, if you count the one with a replaced dial. Now, for the first time ever, all 11/12 watches are shown side-by-side. Please click the following picture to enlarge.


The Single Red Sea-Dwellers and their owners

01 – Ian Koblick
Let’s start with one of the lowest case numbers known, 1602915. This watch has no gas escape valve and belonged to Tektite 1 back up Aquanaut Ian Koblick. In January 1969, Tektite 1 was an attempt of the US Navy and NASA to live and work in an underwater habitat for 60 days. Tektite 1 set a new world’s record for the longest saturated dive by a single team. Ian Koblick participated also in Tektite 2, where, apart from being an Aquanaut, he was support coordinator for site preparation and logistics. The caseback of this watch is engraved with Ian G. Koblick, Tektite 1, 1969.

Caseback stamps: II.67
GEV: no


02 – Philippe Cousteau
According to Antiquorum, 1602920 belonged to Philippe Cousteau, the son of the famous ocean explorer Jacques Cousteau. Philippe’s watch features a Double Red Mk 1 dial with faded red colour instead of the typical 500 metres dial. Considering the extremely early case number of this watch, it is more than likely that this watch started its life as a Single Red, but received a replacement dial from Rolex. Philippe was a technical adviser and crew member of SEALAB 3. In January 1969, SEALAB 3 was an attempt to live at a depth of 100 fathoms (610 ft/185 m). It is said that all Aquanauts of SEALAB 3 had been equipped by Rolex with Sea-Dweller prototypes featuring gas escape valves. This mission was Rolex’s great opportunity to test the gas escape valve under real life conditions. The program lasted only two days and was abandoned due to the tragic death of one of the Aquanauts.

Caseback stamps: VI.67
GEV: yes

1602922 was published in Mondani’s book “Rolex Submariner Story” from 2009 on page 158. Its case number is only 2 numbers away from Phillipe Cousteau’s watch and it also features the gas escape valve. The caseback has early, hand-engraved Patent Pending engravings.

Caseback stamps: VI.67
GEV: yes


1602928 was auctioned by Sotheby’s in June 2013 for USD 383,000.00. According to the auctioneer’s website, this watch belonged to an accomplished American diver who started his diving career in the Underwater Demolition Team, the precursor to the Navy SEALs. The bezel was lost on a salvage dive at a depth exceeding 200 metres.

GEV: no

1602931 was auctioned by Antiquorum in November 2012 for CHF 490,900.00. The watch features a gas escape valve and an early Patent Pending caseback with hand engravings. According to Antiquorum the watch came from a Japanese collector.

Caseback stamps: VI.67
GEV: yes


06 – Richard A. Waller
This watch surfaced on the Vintage Rolex Forum in December 2010. The post started with: “I have a Sea Dweller that was given to my Father by the Rolex Co. in 1969 after he completed the longest sustained saturation dive in an underwater habitat called Tektite1.” The caseback of this watch is engraved with “Tektite 1, Richard A. Waller, 2-15 to 4-15-69”. Richard A. Waller was a Tektite 1 Aquanaut who lived in the underwater habitat for 58 days. He and the other 3 Aquanauts established a new world’s record for saturated diving by a single team.

GEV: no

07 – Robert Palmer Bradley
1602913 belonged to Robert Palmer Bradley. Bob started his career a US Navy fighter pilot. In spite of an injury that forced him to retire from flying, Bob was always in search of adventure. He became a pilot of the Deepstar 4000, a deep sea submersible designed by the famous ocean explorer Jacques Cousteau and built by Westinghouse. In November 1968, Rolex presented this watch to Robert Palmer Bradley to commemorate the 500th dive of the Deepstar 4000. Bob was also known as a marine biologist and commercial diver. He died in a diving accident in November 1973.

Read more: Bob Bradley’s Single Red Sea-Dweller

GEV: no

Caution! 1759659 is not a real Single Red Sea- Dweller. This watch was originally a rare non-valve Double Red Sea-Dweller assembled in 1970/71. The dials were swapped to create the illusion of an early prototype. Case number and movement number of this watch are consistent with other non-valve Double Red Sea-Dwellers from the same period. The Single Red dial installed in this watch suffered a water damage.

Caseback stamps: VI.67
GEV: no

Read more: Monochrome promoting a Fake Rolex Single Red Sea-Dweller

09 – Dr. Ralph W. Brauer
1820177 is the very first valve prototype. This watch was found in fall 2000 in Dr. Ralph W. Brauer’s estate after his passing. Brauer was a marine scientist and leading hyperbaric researcher. In 1968, Dr. Brauer took part in Comex’s Physalie 1, 2 & 3 experiments that established new depth records. Together with Comex founder Henri-Germain Delauze, he descented below 1000 feet in order to study the High-Pressure Nervous Syndrome that occurs beyond 1000 feet. Brauer was scheduled to take part in Comex Hydra 1, the first human trial with hydrogen-oxygen. His watch is equipped with a gas escape valve and an early Patent Pending caseback with hand engravings.

Read more: The Sea-Dweller Chronicles: Genesis of the decompressing Watch

Caseback stamps: VI.67
GEV: yes


This watch was offered by 10 Past Ten some time ago. Apparently it is equipped with a gas escape valve.

GEV: yes

Another Single Red I found on the web. The crystal of this watch is quite worn, suggesting that the watch was in use as diver equipment. This particular watch has no valve.

GEV: no


Watch number 12 is so far the last Single Red I was able to find. This watch has no valve either.

GEV: no

It is interesting to see that 5 Single Red Sea-Dwellers out of 12 are equipped with a gas escape valve.

Single Red Sea-Dwellers with gas escape valve have casebacks with very distinctive engravings. The following picture compares such a caseback (left) with a later Patent Pending caseback from the 2.1 million range.

Comparison casebacks, left SRSD with valve, right DRSD

Discover the complete history of the Rolex Sea-Dweller from its inception in 1967 to the moment the French professional diving company Comex started using it in 1972:

Read more: The Sea-Dweller Chronicles: Genesis Of The Decompressing Watch

Read more: The Sea-Dweller Chronicles: Dry Run And Teaming Up With Comex

History Of The Rolex Sea-Dweller

Single Red Sea-Dwellers play a central role in the history of Rolex diving watches. Please click the following infographic to zoom in.

History of the Rolex Sea-Dweller

This visual timeline is also available as a high quality print with a size of 150 x 85 cm (59 x 33 inch). HD Inkjet on synthetic paper, laminated. There are two versions:

Regular:  EUR 120.00 plus shipping.

Limited: 50 pieces, numbered, signed by Bob Barth in Florida: Price on request.

Bob Barth is a former US Navy Aquanaut who pioneered saturation diving during the late 1950s and 1960s. He was a crew member of the US Navy Genesis and US Navy SEALAB 1, 2 and 3. Bob Barth wrote a technical analysis on how to avoid the popping off of watch crystals during decompression by using a one-way helium valve. His analysis ended up with Rolex Geneva and the rest is history.

Read more: The SEALAB Chronicles: A Journey To Panama City

If you are interested please send an email to: jose( )perezcope( )com

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  • Well done, Perezcope! An outstanding summary of the history of the SD’s. From the latest models the 116600 is for me the quintessence of spirit of the SD’s. If I could have only one watch, that would be it.


  • Lovely article, but ‘Deep Sea Challenge’ and ‘Sea Dweller Deepsea Challenge’ are spelt incorrectly on the visual timeline.


  • I read your article with interest as l have patent pending sea dweller, serial no 17209.. with replaced dial and original box,tags and papers,is this the one your missing?


    • I shouldn’t think so as the SRSD’s prototypes did not come with box and papers when new as they were trial watches and not available for purchase.


  • So you have a Single Red with a Double Red dial, likely replaced because of damage (Philippe Cousteau’s watch) and then you have a Double Red with a Single Red dial (The fake monochrome watch) Maybe… someone got hands on Philippe’s original dial and sold it, then someone created a franked watch with it, how about that for a conspiracy theory? haha


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