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The Sea-Dweller is the Rolex reference built for saturation diving — the Submariner with a helium escape valve. The line opens in 1967 with a small batch of Single Red prototypes hand-made in Geneva for the US Navy's SEALAB 3 programme and the Tektite I saturation experiment. Civilian retail begins in 1971 with the 1665 Double Red. The line runs through four canonical references over fifty years, with the 116600 closing the pre-2020 small-case era in 2017.
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[[File:Sea-dweller vintage poster.webp|thumb|center|640px|alt=Rolex Sea-Dweller 1979 magazine advertisement|Rolex Sea-Dweller 1979 magazine campaign: “Why the Rolex Sea-Dweller never gets the bends”]]
</div>
 
The Sea-Dweller is Rolex's saturation-diving line, distinguished from the Submariner by its helium escape valve. Development examples appear in 1967, and civilian sales of the 1665 followed in the early 1970s. The historical references covered here are 1665, 16660, 16600, and 116600.


The operational distinction sits at 9 o'clock on the case. A one-way helium release valve, Swiss patent CH492246 (filed November 1967, granted June 1970), lets helium dissolved in the watch during long mixed-gas chamber dives escape during decompression without popping the crystal off the case. The Submariner has no valve. Saturation divers need one.
The operational distinction sits at 9 o'clock on the case. A one-way helium release valve, Swiss patent CH492246 (filed November 1967, granted June 1970), lets helium dissolved in the watch during long mixed-gas chamber dives escape during decompression without popping the crystal off the case. The Submariner has no valve. Saturation divers need one.


Every pre-2020 Sea-Dweller reference is covered here. The current-production 126600 (2017 onward) and 126603 (2019 onward) are not.
This hub stops at the 2014–2017 116600. Current references 126600 and 126603 are outside this historical scope.
 
[[File:Sea-dweller vintage poster.webp|thumb|center|400px|alt=Rolex Sea-Dweller 1979 magazine advertisement|Rolex Sea-Dweller 1979 magazine campaign: "Why the Rolex Sea-Dweller never gets the bends"]]


== Common entry points ==
== Common entry points ==


<div class="rp-grid">
<div class="rp-grid">
<div class="rp-card"><div class="rp-card-body"><div class="rp-card-meta">Identifying a vintage acrylic-crystal SD?</div><div class="rp-card-title">[[Reference:1665|1665]]</div><div class="rp-card-text">Caliber 1575 without quickset, three dial generations — Single Red prototypes, Double Red Mk I–IV, Great White Mk 0–IV — and the 1976–1981 COMEX 300-unit run.</div></div></div>
<div class="rp-card"><div class="rp-card-body"><div class="rp-card-meta">Identifying a vintage acrylic-crystal SD?</div><div class="rp-card-title">[[Reference:1665|1665]]</div><div class="rp-card-text">Caliber 1575 without quickset, Single Red prototypes, Double Red dials, Great White dials, and a documented COMEX delivery series.</div></div></div>
<div class="rp-card"><div class="rp-card-body"><div class="rp-card-meta">Researching a Triple Six?</div><div class="rp-card-title">[[Reference:16660|16660]]</div><div class="rp-card-text">First sapphire-crystal Sea-Dweller, depth doubled to 1,220m, Andrea Piccinini's eight-tier dial taxonomy.</div></div></div>
<div class="rp-card"><div class="rp-card-body"><div class="rp-card-meta">Researching a Triple Six?</div><div class="rp-card-title">[[Reference:16660|16660]]</div><div class="rp-card-text">First sapphire-crystal Sea-Dweller, with a 1,220 m rating and several documented dial and caseback generations.</div></div></div>
<div class="rp-card"><div class="rp-card-body"><div class="rp-card-meta">Cross-checking a long-run modern SD?</div><div class="rp-card-title">[[Reference:16600|16600]]</div><div class="rp-card-text">The twenty-year long run on caliber 3135, three lume eras (tritium, Luminova, Super-LumiNova), and the last Sea-Dweller with an aluminum bezel insert.</div></div></div>
<div class="rp-card"><div class="rp-card-body"><div class="rp-card-meta">Cross-checking a long-run modern SD?</div><div class="rp-card-title">[[Reference:16600|16600]]</div><div class="rp-card-text">The long 3135 run, with tritium, Luminova, and Super-LumiNova dial eras, and the last Sea-Dweller with an aluminum bezel insert.</div></div></div>
</div>
</div>


== Vintage acrylic-crystal era ==
== Vintage acrylic-crystal era ==


The 1665 is the only Sea-Dweller with an acrylic crystal, and the reference that introduced the helium escape valve. It runs caliber 1575, dated but without quickset. Sixteen years of production cover three dial generations, from the Single Red through Double Red Mk I–IV and Great White Mk 0–IV.
The 1665 is the only Sea-Dweller with an acrylic crystal and the reference that introduced the helium escape valve. It runs caliber 1575, with a date and no quickset. Its dial record includes Single Red prototypes, Double Red variants, and Great White examples.


{| class="wikitable" style="width:100%;"
{| class="wikitable" style="width:100%;"
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! Reference !! Production !! Movement !! Crystal !! Depth !! Key distinction
! Reference !! Production !! Movement !! Crystal !! Depth !! Key distinction
|-
|-
| [[Reference:1665|1665]] || 1967 prototypes; 1971 civilian; 1983 end || 1575 || Acrylic || 610m / 2000ft || First Sea-Dweller. Three dial generations: Single Red (12 surfaced), Double Red Mk I–IV (Patent Pending caseback Mk I in 1.7M and 2.1M batches), Great White Mk 0–IV. COMEX 300 units 1976–81 with issue numbers 2000–2300. Asprey Khanjar branch with Sultan Qaboos crest.
| [[Reference:1665|1665]] || 1967 prototypes; civilian examples from the early 1970s; production into the early 1980s || 1575 || Acrylic || 610m / 2000ft || First Sea-Dweller. Single Red, Double Red, and Great White dial groups; documented COMEX and Oman-signed branches.
|}
|}


== Triple Six — sapphire crystal, cal 3035 (1978–1988) ==
== Triple Six — sapphire crystal, cal 3035 (1978–1988) ==


The 16660 is the first sapphire-crystal Sea-Dweller, the first with a unidirectional bezel, and the first with a quickset date. Caliber 3035 replaces the 1575, and the depth rating doubles to 1220m / 4000ft. Production overlaps the 1665 for five years, 1978 to 1983.
The 16660 is the first sapphire-crystal Sea-Dweller, the first with a unidirectional bezel, and the first with a quickset date. Caliber 3035 replaces the 1575, and the depth rating rises to 1,220 m / 4,000 ft. Production overlaps the final 1665 examples.


{| class="wikitable" style="width:100%;"
{| class="wikitable" style="width:100%;"
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! Reference !! Production !! Movement !! Crystal !! Depth !! Key distinction
! Reference !! Production !! Movement !! Crystal !! Depth !! Key distinction
|-
|-
| [[Reference:16660|16660]] || 1978–1988 || 3035 || Sapphire || 1220m / 4000ft || "Triple Six". Andrea Piccinini's 8-tier dial taxonomy (MK0 / MK1 / MK1 bis / MK2 Beyeler matte "Pallettoni" → MK3 Stern glossy spider dial → MK4 / MK4 bis Lemrich → MK5 Beyeler "Bicchierini"). Caseback typology external Mk1–4 + internal Mk1–3. COMEX ~200 units 1980–84 issue 3000–3199 in two batches. Tiffany-signed branch the rarest retailer-signed Sea-Dweller.
| [[Reference:16660|16660]] || 1978–1988 || 3035 || Sapphire || 1220m / 4000ft || "Triple Six". Several dial and caseback generations are documented, along with COMEX and Tiffany-signed examples.
|}
|}


== Long-run cal 3135 (1989–2008) ==
== Long-run cal 3135 (1989–2008) ==


The 16600 carries the 16660 case forward and changes the movement to caliber 3135 with its full balance bridge. Applied indices with white gold surrounds run throughout. Production spans three lume eras — tritium on the MK1, a short Luminova window on the MK2 from late 1998 to early 2000, then Super-LumiNova on the MK3. The 16600 is the last Sea-Dweller with an aluminum bezel insert and the last to wear tritium.
The 16600 carries the 16660 case forward and changes the movement to caliber 3135 with its full balance bridge. Applied indices with white-gold surrounds run throughout. Surviving examples show tritium, Luminova, and Super-LumiNova dial eras. The 16600 is the last Sea-Dweller with an aluminum bezel insert; early examples also retain tritium.


{| class="wikitable" style="width:100%;"
{| class="wikitable" style="width:100%;"
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! Reference !! Production !! Movement !! Crystal !! Depth !! Key distinction
! Reference !! Production !! Movement !! Crystal !! Depth !! Key distinction
|-
|-
| [[Reference:16600|16600]] || 1989–2008 || 3135 || Sapphire || 1220m / 4000ft || The long-run Sea-Dweller. 20 years of continuous production — longest of any SD reference. MK1 tritium → MK2 Luminova "SWISS" → MK3 Super-LumiNova "SWISS MADE" → MK4 short-FT. 93160 bracelet throughout, not 93150. COMEX 16600 ~200 units in 1992 first batch (issue 32XX, straight caseback engraving) + 1997 second batch (issue 33XX, curved engraving — final Rolex–COMEX delivery). Theo Mavrostomos #3379 case U139'751 the most-documented SD example. Polipetto Polizia di Stato 78-unit 2008 commission.
| [[Reference:16600|16600]] || 1989–2008 || 3135 || Sapphire || 1220m / 4000ft || Long 3135 run. Documented tritium, Luminova, and Super-LumiNova eras; 93160 bracelet; COMEX and Polipetto institutional branches.
|}
|}


== Modern reissue — 116600 (2014–2017) ==
== Modern reissue — 116600 (2014–2017) ==


After the 116660 Deepsea moved the Sea-Dweller line to 44mm in 2008, the 116600 returns the reference to its canonical 40mm Oyster case. Three-year production. Caliber 3135 with Parachrom Blu hairspring (first Parachrom on a Sea-Dweller). Cerachrom ceramic bezel insert with platinum-coated graduations. Maxi dial with applied white-gold-surround indices and Chromalight lume. The "4000" depth designation drops from the dial despite the watch being marketed as "Sea-Dweller 4000".
After the 116660 Deepsea moved the line to a 44 mm case in 2008, the 116600 returned to a 40 mm Oyster case. It uses caliber 3135 with a Parachrom Bleu hairspring, a Cerachrom bezel insert, applied white-gold-surround indices, and Chromalight lume. The watch is marketed as Sea-Dweller 4000 even though “4000” is not printed on the dial.


{| class="wikitable" style="width:100%;"
{| class="wikitable" style="width:100%;"
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! Reference !! Production !! Movement !! Crystal !! Depth !! Key distinction
! Reference !! Production !! Movement !! Crystal !! Depth !! Key distinction
|-
|-
| [[Reference:116600|116600]] || 2014–2017 || 3135 + Parachrom Blu || Sapphire || 1220m / 4000ft || Three-year reissue. First Cerachrom-bezel Sea-Dweller. Maxi dial, Chromalight lume, 97200 bracelet with Glidelock + Fliplock. Last 40mm Sea-Dweller before the 126600 took the line to 43mm. No mark generations — single dial, single bracelet, cleanest variant set in the SD line. Random scrambled serials throughout.
| [[Reference:116600|116600]] || 2014–2017 || 3135 + Parachrom Bleu || Sapphire || 1220m / 4000ft || 40 mm reissue with Cerachrom bezel, Maxi dial, Chromalight lume, and 97200 bracelet with Glidelock and Fliplock. Later 126600 moved the case to 43 mm.
|}
|}


== Helium escape valve ==
== Helium escape valve ==


The valve sits at 9 o'clock on every Sea-Dweller, covered by Swiss patent CH492246, filed 6 November 1967 and granted June 1970. The concept came out of SEALAB diver Bob Barth's feedback on crystals lost during chamber decompression. Helium dissolves through case gaskets at saturation pressure; on ascent the trapped gas expands and pops the crystal off the case if it has no way out. The mechanism itself is a one-way spring-loaded relief valve. Internal pressure above the spring threshold opens it, and the spring re-seats on the way back down to keep water and dirt out.
The valve sits at 9 o'clock on Sea-Dweller cases and is covered by Swiss patent CH492246, filed 6 November 1967 and granted in June 1970. During saturation work, helium can enter a watch case; during decompression, a one-way spring-loaded valve lets excess internal pressure escape without opening the case. The development history includes feedback from saturation divers, including Bob Barth.


The 1665 carries the valve in its first generation. The 16660 enlarges it for the 1220-metre depth rating, and the 16600 and 116600 inherit the larger unit.
The 1665 carries the valve in its first generation. The 16660 enlarges it for the 1220-metre depth rating, and the 16600 and 116600 inherit the larger unit.
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== Historical anchors ==
== Historical anchors ==


* 1967 — first Single Red prototypes delivered. Hand-made in Geneva for SEALAB 3 and Tektite I aquanauts, with Rolex USA's T. Walker Lloyd hand-picking the divers who received them. Jose Pereztroika's serial-by-serial census for Perezcope documents at least 11 examples.
* 1967: first Single Red prototypes are reported in connection with SEALAB 3 and Tektite I. Perezcope's serial census documents at least 11 examples.
* 15 February 1969 — Berry Cannon's death on SEALAB 3. He wore a valved Single Red during the dive to repair a helium leak in the habitat; the Navy investigation attributed his death to CO2 poisoning after his rebreather ran out of baralyme, while a 2024 reinvestigation by ocean engineer Kevin Hardy for ''InDEPTH'' argues electrocution is the more likely cause.
* 15 February 1969: Berry Cannon died during SEALAB 3. The Navy investigation attributed the death to CO2 poisoning; a later InDEPTH article argues for electrocution. The cause remains disputed.
* Late 1971 — first co-branded Rolex–COMEX delivery. Batch of ten in the 2.6M serial range, double-signed and numbered 1 through 10.
* Late 1971: an early co-branded Rolex–COMEX delivery is documented in the 2.6M serial range.
* 17 February 1972 — formal Rolex–COMEX exclusivity letter. From Rolex Geneva to John M. Kelly, Singapore.
* 17 February 1972: a Rolex–COMEX letter records the relationship between Rolex Geneva and John M. Kelly in Singapore.
* 24 May 1972 — Physalie 6 record. Robert Gauret and Patrice Chemin reach 2000 feet / 610 metres wearing Double Red Sea-Dwellers. Decompression ran 233 hours across 17 days.
* 24 May 1972: Robert Gauret and Patrice Chemin reached 2,000 feet / 610 metres during the Physalie 6 experiment wearing Double Red Sea-Dwellers.
* 1992 — Theo Mavrostomos Hydra X dive. Reaches 701 metres over 43 days breathing Hydeliox. His 16600 caseback carries the inscription "Theo Mavrostomos – Hydrax – 701 M".
* 1992: Theo Mavrostomos reached 701 metres during a Hydra X dive. His 16600 caseback carries the inscription “Theo Mavrostomos – Hydrax – 701 M”.


== Special branches ==
== Special branches ==
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The four main Sea-Dweller references host institutional and retailer-signed branches whose provenance and authentication get their fuller treatment on the individual reference pages:
The four main Sea-Dweller references host institutional and retailer-signed branches whose provenance and authentication get their fuller treatment on the individual reference pages:


* Patent Pending caseback DRSD (1665 Mk I) — ~100 examples, hand-engraved caseback, 1.7M and 2.1M serial bands. Marcello Pisani's batch tables on WatchProSite identify the canonical anti-fake checks (inside-back last-three-digits stamp present from 2.117M onward).
* Patent Pending caseback DRSD (1665 Mk I): hand-engraved caseback examples in the 1.7M and 2.1M serial bands. Pisani's tables describe the inside-back stamp and batch details.
* COMEX 1665 — 300 numbered units 1976–81, issue 2000–2300, serial 5.14M–6.76M, "600m" depth on the dial. Three dial sub-generations track the Great White Mk system.
* COMEX 1665: a numbered delivery series with 600 m dial markings, documented in the individual reference record.
* COMEX 16660 — ~200 units 1980–84, issue 3000–3199, two batches matching the matte→glossy transition.
* COMEX 16660: a documented delivery series from the early 1980s, with matte and glossy dial groups.
* COMEX 16600 — ~200 units in two batches, 1992 (issue 32XX, straight caseback engraving) and 1997 (issue 33XX, curved engraving). Final Rolex–COMEX delivery.
* COMEX 16600: two documented delivery batches from 1992 and 1997, with different caseback engraving styles.
* Asprey Khanjar 1665 (Oman, Sultan Qaboos) — Red Khanjar with Qaboos signature in 3,566,9xx batch (~80–90 examples), gold Khanjar in 5.0M batch (4–5 known). Battle of Mirbat (July 1972) context.
* Asprey Khanjar 1665: Oman-signed examples with red or gold Khanjar emblems. Counts remain estimates from surfaced watches.
* Single Red Sea-Dweller — hand-made prototypes 1967–69. Pereztroika's census documents at least 11, or 12 counting one that now wears a replaced dial. SEALAB 3 (Philippe Cousteau #1602920), Tektite I (Koblick #1602915, Waller), Deepstar (Bradley #1602913), COMEX Physalie (Brauer #1820177). The Cousteau watch carries a Double Red Mk I dial today, so its Single Red configuration is an inference from the early case number.
* Single Red Sea-Dweller: hand-made prototypes from 1967–69. Perezcope's census lists at least 11 examples; some identifications rely on serial and provenance evidence because later dial replacements exist.
* US Navy Experimental Diving Unit — Patent Pending batch 2 (2.128M) loaned to USN EDU. Charles E. "Chuck" Gross, at the USN Experimental Diving Unit from 1967, was issued an example from the 2,128,xxx batch; his 1000ft saturation dive with the US Navy at Duke University dates to 1969.
* US Navy Experimental Diving Unit: Patent Pending examples from the 2.128M batch are associated with the USN EDU, but issue and loan records should be checked on each watch.
* Polipetto 16600 (Polizia di Stato Sommozzatori, 2008) — 78 units for the 50th anniversary of the Italian State Police Diving Corps. 28 personalised with diver patent number on the caseback. Octopus emblem on the dial.
* Polipetto 16600: an Italian State Police Diving Corps commission documented as 78 watches, with some personalised casebacks.
* Tiffany & Co retailer-signed 16660 — handful of surviving examples, barely surfaces on the public market.
* Tiffany & Co retailer-signed 16660: a small group of surviving examples documented in auction and specialist records.


== Related families ==
== Related families ==
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* [[Reference:Serial-numbers|Serial numbers by year]] — numeric 1967–1987, letter prefix 1987–2010, random alphanumeric 2010 onward
* [[Reference:Serial-numbers|Serial numbers by year]] — numeric 1967–1987, letter prefix 1987–2010, random alphanumeric 2010 onward
* [[Reference:Movements|Movement reference]] — caliber 1575 (1665), 3035 (16660), 3135 (16600 and 116600, the latter with Parachrom Blu)
* [[Reference:Movements|Movement reference]] — caliber 1575 (1665), 3035 (16660), 3135 (16600 and 116600, the latter with a Parachrom hairspring)
* [[Reference:Bracelets|Bracelet & clasp guide]] — the 9315, 93150, 93160, 78360, and 97200 fitments and the clasp date-code key
* [[Reference:Bracelets|Bracelet & clasp guide]] — the 9315, 93150, 93160, 78360, and 97200 fitments and the clasp date-code key


Revision as of 00:13, 22 September 2026


Rolex Sea-Dweller 1979 magazine advertisement
Rolex Sea-Dweller 1979 magazine campaign: “Why the Rolex Sea-Dweller never gets the bends”

The Sea-Dweller is Rolex's saturation-diving line, distinguished from the Submariner by its helium escape valve. Development examples appear in 1967, and civilian sales of the 1665 followed in the early 1970s. The historical references covered here are 1665, 16660, 16600, and 116600.

The operational distinction sits at 9 o'clock on the case. A one-way helium release valve, Swiss patent CH492246 (filed November 1967, granted June 1970), lets helium dissolved in the watch during long mixed-gas chamber dives escape during decompression without popping the crystal off the case. The Submariner has no valve. Saturation divers need one.

This hub stops at the 2014–2017 116600. Current references 126600 and 126603 are outside this historical scope.

Common entry points

Identifying a vintage acrylic-crystal SD?
1665
Caliber 1575 without quickset, Single Red prototypes, Double Red dials, Great White dials, and a documented COMEX delivery series.
Researching a Triple Six?
16660
First sapphire-crystal Sea-Dweller, with a 1,220 m rating and several documented dial and caseback generations.
Cross-checking a long-run modern SD?
16600
The long 3135 run, with tritium, Luminova, and Super-LumiNova dial eras, and the last Sea-Dweller with an aluminum bezel insert.

Vintage acrylic-crystal era

The 1665 is the only Sea-Dweller with an acrylic crystal and the reference that introduced the helium escape valve. It runs caliber 1575, with a date and no quickset. Its dial record includes Single Red prototypes, Double Red variants, and Great White examples.

Reference Production Movement Crystal Depth Key distinction
1665 1967 prototypes; civilian examples from the early 1970s; production into the early 1980s 1575 Acrylic 610m / 2000ft First Sea-Dweller. Single Red, Double Red, and Great White dial groups; documented COMEX and Oman-signed branches.

Triple Six — sapphire crystal, cal 3035 (1978–1988)

The 16660 is the first sapphire-crystal Sea-Dweller, the first with a unidirectional bezel, and the first with a quickset date. Caliber 3035 replaces the 1575, and the depth rating rises to 1,220 m / 4,000 ft. Production overlaps the final 1665 examples.

Reference Production Movement Crystal Depth Key distinction
16660 1978–1988 3035 Sapphire 1220m / 4000ft "Triple Six". Several dial and caseback generations are documented, along with COMEX and Tiffany-signed examples.

Long-run cal 3135 (1989–2008)

The 16600 carries the 16660 case forward and changes the movement to caliber 3135 with its full balance bridge. Applied indices with white-gold surrounds run throughout. Surviving examples show tritium, Luminova, and Super-LumiNova dial eras. The 16600 is the last Sea-Dweller with an aluminum bezel insert; early examples also retain tritium.

Reference Production Movement Crystal Depth Key distinction
16600 1989–2008 3135 Sapphire 1220m / 4000ft Long 3135 run. Documented tritium, Luminova, and Super-LumiNova eras; 93160 bracelet; COMEX and Polipetto institutional branches.

Modern reissue — 116600 (2014–2017)

After the 116660 Deepsea moved the line to a 44 mm case in 2008, the 116600 returned to a 40 mm Oyster case. It uses caliber 3135 with a Parachrom Bleu hairspring, a Cerachrom bezel insert, applied white-gold-surround indices, and Chromalight lume. The watch is marketed as Sea-Dweller 4000 even though “4000” is not printed on the dial.

Reference Production Movement Crystal Depth Key distinction
116600 2014–2017 3135 + Parachrom Bleu Sapphire 1220m / 4000ft 40 mm reissue with Cerachrom bezel, Maxi dial, Chromalight lume, and 97200 bracelet with Glidelock and Fliplock. Later 126600 moved the case to 43 mm.

Helium escape valve

The valve sits at 9 o'clock on Sea-Dweller cases and is covered by Swiss patent CH492246, filed 6 November 1967 and granted in June 1970. During saturation work, helium can enter a watch case; during decompression, a one-way spring-loaded valve lets excess internal pressure escape without opening the case. The development history includes feedback from saturation divers, including Bob Barth.

The 1665 carries the valve in its first generation. The 16660 enlarges it for the 1220-metre depth rating, and the 16600 and 116600 inherit the larger unit.

Historical anchors

  • 1967: first Single Red prototypes are reported in connection with SEALAB 3 and Tektite I. Perezcope's serial census documents at least 11 examples.
  • 15 February 1969: Berry Cannon died during SEALAB 3. The Navy investigation attributed the death to CO2 poisoning; a later InDEPTH article argues for electrocution. The cause remains disputed.
  • Late 1971: an early co-branded Rolex–COMEX delivery is documented in the 2.6M serial range.
  • 17 February 1972: a Rolex–COMEX letter records the relationship between Rolex Geneva and John M. Kelly in Singapore.
  • 24 May 1972: Robert Gauret and Patrice Chemin reached 2,000 feet / 610 metres during the Physalie 6 experiment wearing Double Red Sea-Dwellers.
  • 1992: Theo Mavrostomos reached 701 metres during a Hydra X dive. His 16600 caseback carries the inscription “Theo Mavrostomos – Hydrax – 701 M”.

Special branches

The four main Sea-Dweller references host institutional and retailer-signed branches whose provenance and authentication get their fuller treatment on the individual reference pages:

  • Patent Pending caseback DRSD (1665 Mk I): hand-engraved caseback examples in the 1.7M and 2.1M serial bands. Pisani's tables describe the inside-back stamp and batch details.
  • COMEX 1665: a numbered delivery series with 600 m dial markings, documented in the individual reference record.
  • COMEX 16660: a documented delivery series from the early 1980s, with matte and glossy dial groups.
  • COMEX 16600: two documented delivery batches from 1992 and 1997, with different caseback engraving styles.
  • Asprey Khanjar 1665: Oman-signed examples with red or gold Khanjar emblems. Counts remain estimates from surfaced watches.
  • Single Red Sea-Dweller: hand-made prototypes from 1967–69. Perezcope's census lists at least 11 examples; some identifications rely on serial and provenance evidence because later dial replacements exist.
  • US Navy Experimental Diving Unit: Patent Pending examples from the 2.128M batch are associated with the USN EDU, but issue and loan records should be checked on each watch.
  • Polipetto 16600: an Italian State Police Diving Corps commission documented as 78 watches, with some personalised casebacks.
  • Tiffany & Co retailer-signed 16660: a small group of surviving examples documented in auction and specialist records.

Related families

  • Submariner — the parent line. Same case, same bezel template, with the valve and the depth rating as the functional split.
  • Milgauss — the other specialist tool. Different threat (magnetism, not pressure), same purpose: a Rolex built for one specific working environment.
  • GMT-Master — the parallel sports line. Same Cerachrom transition arrives on both lines in the late 2000s.

Shared references

  • Serial numbers by year — numeric 1967–1987, letter prefix 1987–2010, random alphanumeric 2010 onward
  • Movement reference — caliber 1575 (1665), 3035 (16660), 3135 (16600 and 116600, the latter with a Parachrom hairspring)
  • Bracelet & clasp guide — the 9315, 93150, 93160, 78360, and 97200 fitments and the clasp date-code key

Sources

Primary and specialist

Editorial and market

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