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{{DISPLAYTITLE:Rolex 16660 Sea-Dweller "Triple Six"}}
{{#seo:
{{#seo:
|title=Rolex 16660 Sea-Dweller "Triple Six" — Cal 3035, 1220m, Piccinini Mk Taxonomy | BezelBase
|title=Rolex Sea-Dweller 16660 'Triple Six' — First 4000ft, 1978–1988 | Rolexopedia
|description=The 16660 "Triple Six" is the Cal 3035 Sea-Dweller — 1978 to 1989, 40mm Oyster, first high-beat SD with sapphire crystal and 1220m depth. Piccinini 8-tier dial taxonomy documented.
|description=The Rolex Sea-Dweller 16660, or Triple Six, introduced sapphire crystal, the 1220m / 4000ft rating, caliber 3035, and a unidirectional bezel to the line. It was produced from 1978 into the late 1980s, with matte and glossy tritium dials and a documented COMEX branch.
|keywords=Rolex, 16660, Sea-Dweller, Triple Six, Cal 3035, 1220m, sapphire, Piccinini, Mk dial
|keywords=Rolex 16660, Triple Six, Sea-Dweller 4000, cal 3035, COMEX 16660, MK1 MK2 dial, spider dial, Stern Lemrich Beyeler, Phillips Geneva XI 2020 Lot 128, Godart Johansson, Andrea Piccinini
|image=Ref 16660 hero.webp
|image=Ref 16660 hero.webp
|image_alt=Rolex Sea-Dweller 16660 Triple Six
|image_alt=Rolex Sea-Dweller 16660 Triple Six
|type=article
|type=Article
|og_type=article
|og_type=article
|published_time=2026-05-16T03:32:31Z
|modified_time=2026-08-04T00:09:44Z
|robots=index,follow,max-image-preview:large
|robots=index,follow,max-image-preview:large
}}
}}


<small>[[Reference:sea-dweller|Sea-Dweller]] → '''16660'''</small>
<small>[[Reference:sea-dweller|Sea-Dweller]] › '''16660'''</small>


The 16660 is the watch the 1665 should have been once Rolex had a decade of saturation-diving data to work from. Same case profile, same helium escape valve at 9 o'clock, same dive-bezel architecture. Everything else changes. The crystal moves from domed acrylic to flat sapphire. The bezel goes unidirectional. The depth rating doubles to 1220 metres. The movement gains quickset date. Production runs ten years, 1978 to 1988 (with end-year evidence pointing to early 1989 in some readings), parallel with the 1665 for the first five and on its own for the last five. Collectors call it the Triple Six. The 4000-foot depth rating on the dial is what Rolex put in print.
<div class="rp-lead">
[[File:Ref 16660 hero.webp|thumb|center|640px|alt=Rolex Sea-Dweller 16660 (Triple Six).|Rolex Sea-Dweller 16660 (Triple Six).]]
</div>


[[File:Ref 16660 hero.webp|thumb|right|250px|alt=Rolex Sea-Dweller 16660 Triple Six|Rolex Sea-Dweller 16660 (Triple Six).]]
 
The 16660 is the second Sea-Dweller reference and the first to use a sapphire crystal and a 1220m / 4000ft depth rating. It introduced caliber 3035, a quick-set date, a larger helium escape valve, and a unidirectional bezel while retaining the 40mm Oyster case. Rolex introduced it in 1978; production and delivery records run into the late 1980s before the 16600 took over. Matte and glossy tritium dials, plus a COMEX branch, are documented. “Triple Six” is collector shorthand from the reference number; Rolex used “Sea-Dweller 4000” in period material.
 
<span id="core-facts"></span>


==Core facts==
==Core facts==


{| class="wikitable"
{| class="wikitable rp-facts"
|-
|-
! detail
! detail
Line 27: Line 35:
|-
|-
| family
| family
| Sea-Dweller
| Sea-Dweller 4000
|-
| collector nickname
| "Triple Six"
|-
|-
| production
| production
| 1978 to 1988 (end of production 1989 is documented in some sources)
| introduced 1978; production generally dated to 1988, with some 1989 deliveries during the 16600 changeover
|-
|-
| movement
| movement
| caliber 3035, 27 jewels, 28,800 vph, quickset date
| caliber 3035, 27 jewels, 28,800 vph, quick-set date, hacking seconds, approximately 42–48 hours reserve
|-
|-
| case
| case
| 40mm, helium escape valve at 9 o'clock, Triplock crown
| 40mm Oyster case with helium escape valve and Triplock crown
|-
|-
| crystal
| crystal
| flat sapphire — first Sea-Dweller with sapphire
| flat sapphire; first sapphire-crystal Sea-Dweller reference
|-
|-
| bezel
| bezel
| unidirectional rotating 60-minute, black aluminum insert
| unidirectional revolving bezel with black aluminum insert and 60-minute scale
|-
|-
| depth
| depth rating
| 1220m / 4000ft
| 1220m / 4000ft
|-
|-
| dial families
| dial families
| matte (MK0 to MK2 Beyeler "Pallettoni") and glossy (MK3 Stern, MK4 / MK4 bis Lemrich, MK5 Beyeler "Bicchierini")
| matte early dials and glossy later dials, all factory-original examples using tritium; collector marks vary by source
|-
| COMEX branch
| documented deliveries around 1980–1984; total and batch boundaries are source-dependent
|-
|-
| predecessor
| predecessor
| 1665 (parallel production 1978–1983)
| 1665, which continued in parallel after the 16660 launch
|-
|-
| successor
| successor
| 16600 (introduced 1988/1989, same case + new cal 3135)
| 16600, with caliber 3135 and later production
|}
|}


==Where it sits in the line==
==Where it sits in the line==


The 16660 is the Sea-Dweller's first sapphire-crystal generation and its first 4000-foot depth rating. The 1665 is the saturation-diving prototype reference; the 16660 is the saturation-diving reference built for the long haul. The Triple Six nickname comes from the 4000-foot depth rating and the reference number ending in 660, collector shorthand that has stuck since the late 1980s.
The 16660 replaced the 1665's acrylic crystal and 610m rating with flat sapphire and a 1220m / 4000ft rating. It also brought caliber 3035 with a quick-set date, a larger helium escape valve, and a unidirectional bezel. The 1665 and 16660 overlap in the late 1970s and early 1980s; the 16600 follows with caliber 3135.


The case architecture establishes the standard Sea-Dweller silhouette for the next thirty years. The 16600 inherits the same case with a movement swap; the 116600 returns to it after the 116660 Deepsea detours through 44mm.
All factory 16660 watches use caliber 3035. Claims that the 16660 received the later 3135 confuse it with the 16600. The 16660 dial and case should be dated separately because matte-to-glossy changes, COMEX deliveries, and service replacements overlap.


==Production outline==
==Production outline==


The clearest read of the 16660 is matte versus glossy, then sub-mark within each family.
The 16660 is easiest to describe through its case and dial changes. Rolex did not publish a complete serial-to-dial schedule, and collector marks use different boundaries.


===Matte run (1978 to c. 1983)===
===Early matte production, 1978–around 1983===


Matte black dial with painted tritium hour plots, no white-gold surrounds, the same dial-print convention the 1665 carried through its last years. The dial supplier through this run is Beyeler, the Swiss dial-house Rolex would acquire outright in 2000.
Early watches have matte black tritium dials with painted luminous plots, caliber 3035, sapphire crystal, the revised helium valve, and a unidirectional bezel. Specialist references divide the matte run into several marks, sometimes called MK0 through MK2 or related names. These labels describe dial printing and plot layout; they are not Rolex model variants.


The matte run divides into MK0, MK1, MK1 bis, and MK2 generations per Andrea Piccinini's Italian-specialist classification. MK0 is the rarest — pad-printed from the identical plate used for the 1665 MK1 Patent Pending Beyeler dial, with only the depth rating differing ("1220m" rather than "610m"). MK1 carries the short coronet under 12 o'clock with "f" of "ft" sitting above the "E" in SUPERLATIVE. MK2 has the longer coronet, sometimes touching the triangle, with "f" above the "V" — collectors recognise it as the late matte dial.
===Glossy transition, around 1983–1985===


===Glossy transition (c. 1983 to 1984)===
Rolex moved to glossy black dials with applied white-gold surrounds during the early-to-mid 1980s. Some transitional examples overlap, and the change is dated differently by catalogues and observed serials. The early glossy MK3 is associated with spider-style lacquer cracking; later service or replacement dials can be visually similar.


The transition from matte to glossy lands around the 8.0M serial range per the Watchprosite consensus (Marcello Pisani, Baron, Tim_s). Baron's matte 16660 is at 8.0M (c. 1983); Tim_s documents a matte at 8.2M dated late 1983; the gloss MK3 takes over from 8.5M onward. Catalogue cross-references confirm the window: Rolex's February 1985 catalogue still shows matte, August 1986 shows the white-gold-surround gloss dial.
===Late glossy production, mid-1980s to late 1980s===


===Glossy MK3 — the spider dial (c. 1983 to mid-run)===
Later glossy dials are commonly grouped as MK4, MK4 bis, or MK5 in specialist references. The exact mark names and supplier attributions differ, but all factory-original examples remain tritium marked. The 16600 successor appears in 1989 catalogues while 16660 inventory can still surface with 1989 delivery paperwork.
 
The first glossy run is the Sea-Dweller's most famous manufacturing defect. Stern took over dial supply for this generation and printed the dial without the hyphen in "SEA DWELLER" — the cosmetic marker that identifies the MK3. The defect is in the lacquer. Under ambient UV and thermal cycling, the gloss black surface crazes, bubbles, and opacifies. Rolex offered free service replacements through its service network throughout the rest of the 16660's production and into the 16600 era. The replacement dials look identical face-on but differ on the reverse — Piccinini's forensic work uses reverse-side analysis as the canonical authentication tell.
 
The collector name "spider dial" comes from the crazing pattern — a web-like network of cracks across the glossy surface. A clean MK3 with the original Stern lacquer intact is its own collecting target.
 
===Glossy MK4 onward (mid-run to 1988)===
 
Lemrich takes over dial supply with the MK4. The hyphen returns in "SEA-DWELLER", the coronet elongates slightly, and the lacquer chemistry changes — Lemrich's printing process is grainy under loupe magnification, the print identifier that distinguishes a Lemrich dial across the late Sea-Dweller run. Piccinini identifies a MK4 bis sub-variant inside the Lemrich window. The MK5 Beyeler "Bicchierini" closes the production run — late gloss tritium with the same face print as the service replacements, distinguishable from earlier glossy generations only on the reverse.
 
The "Bicchierini" name — Italian for "small glasses" — describes the white-gold-surround applied tritium plots that all glossy 16660 dials carry. Earlier matte dials use painted plots without the surround.
 
===End of production (1988 / 1989)===
 
The end-of-production year is documented inconsistently across the literature. One reading gives 1989, another gives about 1988, Monochrome gives 1978 to 1989. Rolex's April 1989 catalogue already shows the 16600 successor. The serial-cap evidence points to early 1989 deliveries cleaning out 1988-produced stock. The cleanest summary: production runs from 1978 to 1988, with 1989 deliveries continuing through stock channels into the cross-over with the 16600.


==Movement notes==
==Movement notes==


The caliber 3035 is a step-change from the cal 1575 of the 1665.
Caliber 3035 powers the 16660 throughout its run. Published specifications give 27 jewels, 28,800 vph, quick-set date, hacking seconds, and approximately 42–48 hours of reserve depending on the source. The movement is chronometer-rated in the Sea-Dweller context and is the direct successor to the 1575 used in the 1665.


Specifications:
The 3035 has a balance cock rather than the full balance bridge later used on caliber 3135. That difference identifies the movement family, but does not by itself date every part inside a serviced watch. Read the caliber engraving, movement serial, service records, and case serial together.
 
* 28.5mm × 6.3mm
* 27 jewels (up from the 1575's 25)
* 28,800 vph / 4 Hz (up from the 1575's 19,800 vph)
* Power reserve 42 to 48 hours (Monochrome cites 42h; Grail Watch and several specialist movement references give 48h — print both with attribution if cited)
* Quickset date (new for the Sea-Dweller line — the 1665 lacked it)
* Hacking seconds
* Bidirectional perpetual rotor
* Free-sprung Microstella balance
* Glued hairspring — laser-welded only on the successor cal 3135
* Adjusted to 5 positions plus temperature
* COSC chronometer certified
 
The quickset is the operational change that defines the 16660 in daily wear. Advancing the date past a missed month no longer requires twenty-four cycles of the hands. The crown at position two, counter-clockwise, advances the date wheel only. The owner experience is fundamentally different from the 1665, even with no other visible change.


==Dial map==
==Dial map==


The 16660 dial taxonomy is the work of Andrea Piccinini, with mark boundaries supported by Watchprosite specialist threads (Marcello Pisani, Baron, Tim_s) and Italian collector pages (Stefano Mazzariol blog, Virginia Bozza's marks essay). The English-canon flatten this to "matte" and "glossy"; the Italian-specialist canon recognises eight sub-marks across the run.
16660 dials are generally divided into an early matte group and a later glossy group. Specialist works use different mark numbers, so the labels below are shorthand rather than a factory register.
 
Dial suppliers:
 
* Beyeler — MK0, MK1, MK1 bis, MK2 matte "Pallettoni"; MK5 glossy "Bicchierini". Beyeler was acquired by Rolex in 2000, ending its external-supplier role.
* Stern — MK3 glossy. The spider-dial generation. Same Stern that supplied the 1665 Mk2 chocolate dials and the COMEX 600m print of 1977–1979.
* Lemrich & Cie — MK4 and MK4 bis glossy. Grainy print under magnification.
 
===Matte MK0 Beyeler "Pallettoni"===
 
Pad-printed from the identical plate used for the 1665 MK1 Patent Pending Beyeler dial. Only the depth rating differs — "1220m" on the 16660, "610m" on the 1665 Patent Pending. A handful are known. Authentication runs on reverse-side comparison rather than face-side typography, which matches the two references at this generation line-for-line.
 
===Matte MK1 Beyeler "Pallettoni"===
 
Short coronet under the 12 o'clock triangle. The "f" of "ft" in the depth rating sits above the "E" in SUPERLATIVE. Painted tritium plots, no white-gold surrounds. The "Pallettoni" name comes from the large round lume plots — Italian for "large round disks".
 
===Matte MK1 bis Beyeler===
 
Nearly identical to MK1. The diagnostic is the vertical alignment of the "T" in PERPETUAL against ROLEX — a print-pass difference rather than a typography change.
 
===Matte MK2 Beyeler "Pallettoni"===
 
Longer coronet, sometimes touching the 12 o'clock triangle. The "f" of "ft" sits above the "V" in SUPERLATIVE rather than the "E" — the canonical MK1 vs MK2 tell. Thicker print weight and serif variation. Late matte production.
 
===Glossy MK3 Stern "Bicchierini" — the spider dial===
 
White-gold-surround applied tritium plots ("Bicchierini" — Italian for "small glasses"). No hyphen between SEA and DWELLER — the unique MK3 typography that does not repeat. Stern lacquer chemistry produces the spider crazing under UV and thermal exposure. Rolex's service network issued free replacement dials, and the replacements look identical face-on but differ on the reverse.
 
===Glossy MK4 Lemrich "Bicchierini"===
 
Hyphen restored. Coronet elongates slightly relative to MK3. Refined font. Crack-resistant lacquer — the spider problem ends with the Lemrich generation. Print grain visible under loupe magnification, the typographic signature of Lemrich-supplied dials across the late Sea-Dweller line.


===Glossy MK4 bis Lemrich===
===Matte dials===


Sub-variant identified by Piccinini. Authentication tells are smaller than the MK3-to-MK4 transition but documented in his classification work.
Matte black dials have painted tritium plots and the 4000ft / 1220m depth text. Collectors subdivide them into several marks using coronet shape, letter alignment, plot geometry, and the spacing of the lower text. These features are useful only when matched with the case, movement, serial, and provenance.


===Glossy MK5 Beyeler "Bicchierini"===
===Glossy dials and spider cracking===


Beyeler returns for the final glossy run. The face print matches the Lemrich MK4 typography closely enough that reverse-side analysis is the canonical identification method. Tritium service-replacement dials issued through the service network share the MK5 face print but differ on the reverse — collectors check the back-side print to separate factory-original MK5 from later service dials.
Glossy dials use applied white-gold surrounds over tritium plots. Early glossy examples can show lacquer cracking commonly called spider dials. Rolex service replacements and later glossy marks can look similar from the front; reverse-side markings, feet, plot attachment, and service history are stronger evidence than a name such as MK3 or MK4 alone.


==="Frozen dial"===
===Tritium and service dials===


Late-run milky tritium that has aged to a matte appearance from accelerated lume oxidation. A collector observation rather than a factory variant. Identifiable from the painted lume plots reading as off-white or cream rather than the cleaner tritium yellow that older dials carry.
Factory 16660 dials are associated with T SWISS T < 25 markings. A later Luminova or Super-LumiNova dial on a 16660 should be recorded as a service or replacement part unless individual evidence proves otherwise. “Frozen” or milky tritium is an ageing description, not a separate factory generation.
 
===Tritium throughout===
 
Every factory 16660 carries the post-1971 Bern Convention "T SWISS T < 25" marking at six o'clock. No Luminova, no Super-LumiNova, no Chromalight on a factory 16660 dial. A 16660 with non-tritium lume is a service replacement.


==Case, bezel, crystal, and crown notes==
==Case, bezel, crystal, and crown notes==


The 16660 case keeps the 40mm Oyster diameter and the 20mm lug width of the 1665. The major change is the depth rating — doubled from 610m to 1220m through case thickness, gasket redesign, and an enlarged helium escape valve at 9 o'clock. The crystal moves from domed acrylic to flat sapphire — the first sapphire on a Sea-Dweller — and the bezel becomes unidirectional, the first unidirectional bezel on a Sea-Dweller.
The 16660 has a 40mm Oyster case, flat sapphire crystal, helium escape valve, Triplock crown, and 1220m / 4000ft rating. The larger valve and sapphire crystal are the principal case changes from the 1665. Rolex describes the 1978 Sea-Dweller as the point at which the line moved to the 4000ft rating.


===Caseback typology — Andrea Piccinini's classification===
===Caseback and valve===


The 16660 caseback is the most thoroughly documented Sea-Dweller caseback. Piccinini's authentication work identifies four external engraving variants and three internal variants. The external taxonomy:
Civilian casebacks carry period Rolex and depth-related engravings; COMEX examples add an external issue number. Internal stamps and serial markings vary by batch. The caseback, valve, crystal, movement, and dial should be assessed together when checking originality.
 
* External Mark 1 (serials below approximately 6.6M) — single crown between "ROLEX" and "OYSTER", no "ORIGINAL" prefix before "GAS ESCAPE VALVE", elongated open "G".
* External Mark 2 (serials around 7.3M to 7.5M) — two crowns flanking the text ("ROLEX/Original" and "OYSTER/Valve"). "ORIGINAL" present. Moderately open "G".
* External Mark 3 (serials around 8.0M onward through R-prefix) — two crowns. ORIGINAL present. Rounded "G", tighter spacing, lighter strike, closer to the knurled edge.
* External Mark 4 — completely blank exterior. Small late-run subset.
 
The internal typology tracks the expiry of the Rolex Oyster patent in the early 1980s:
 
* Internal Mark 1 — "PATENTED" present (pre-expiry production).
* Internal Mark 2 — "PATENTED" milled off (transitional casebacks where Rolex removed the now-invalid wording from stock backs).
* Internal Mark 3 — "PATENTED" absent from the design entirely (post-expiry production).
 
Service casebacks are stamped "ROLEX SA" internally and depart from the original engraving conventions. Rolex Service Centre replacements from the 1990s onward use this service variant.
 
===Helium escape valve===
 
The valve carries over from the 1665 with an enlarged spring chamber and updated gaskets to handle the doubled depth rating. The wider patent and operational history sit on the [[Reference:sea-dweller#Helium escape valve|family hub]]; on the 16660 the change is the size, not the architecture.
 
===Crystal and crown===
 
Flat sapphire crystal replaces the domed acrylic of the 1665. The unmagnified date window — no Cyclops — carries forward from the 1665 and continues through the 16600 and 116600. Sapphire enables a thinner, more pressure-resistant crystal at the 1220m rating, where acrylic would deform.
 
The crown is the 7mm Triplock, the screw-down dive crown with three internal gaskets. The same crown architecture the 5512, 5513, 1680, and 1665 wear.


===Bezel===
===Bezel===


Unidirectional rotating 60-minute, black anodized aluminum insert. The unidirectional ratchet is the first on a Sea-Dweller — the 1665 had a bidirectional bezel. The change matters operationally for divers, who use the bezel as a dive-time timer: a bidirectional bezel could be bumped clockwise underwater, shortening the remaining-air display; a unidirectional bezel can only be bumped in the safe direction (away from elapsed time).
The 16660 uses a unidirectional revolving bezel with a black aluminum insert and 60-minute scale. This differs from the bidirectional 60-unit bezel documented on the 1665. Insert replacement and cross-fitment with other period Rolex divers are possible, so the bezel is not a stand-alone authentication test.


==Bracelet, end-links, clasps==
==Bracelet, end-links, clasps==


The 16660 wears the 93150 Oyster bracelet through its early-to-mid production, transitioning to the 93160 from approximately 1983. The end-link code is 380 — the period-correct fitment for Submariner 16800 / 168000 and Sea-Dweller 16660. Folded-link / hollow-end-link construction is the earlier configuration; solid end-links on 93160 begin to appear from approximately 1983 but remain rare on production-era 16660s.
Documented fitments include the 93150 and later 93160 Oyster bracelets, with end-link and clasp details varying across the production span. Specialist references commonly associate 380-family links with earlier 93150 examples and 580/592-family links with later configurations, but the individual case and delivery record control.


The Fliplock diver's wetsuit extension is the clasp's distinguishing feature — folding out to add length for wear over a 7mm dive-suit cuff. Clasp two-letter date codes (for example "I8" = Q3 1978) date the bracelet, not the watch head. Service-bracelet date codes can run years ahead of the watch case.
The Fliplock diver extension is part of the period bracelet system. A clasp or end-link code dates the bracelet, not the watch head. Service bracelets, clasp swaps, and retail-stock overlap can produce a later bracelet on an earlier case.


==Special branches==
==Special branches==
Line 211: Line 134:
===COMEX 16660===
===COMEX 16660===


The COMEX-issued 16660 delivery runs 1980 through 1984. Production is approximately 200 units total, COMEX issue numbers 3000 through 3199, split across two batches that track the matte-to-glossy transition.
COMEX received 16660 watches around 1980–1984. The branch uses a COMEX dial and external issue numbering, with matte and glossy deliveries documented. Specialist sources often describe roughly 200 watches, but the exact total and the split between matte and glossy watches are not settled; one source describes the initial issue range 3001–3099 and later numbers 3100–3199, while auction catalogues give different batch descriptions.
 
First batch (matte dial): approximately 100 watches, COMEX issue numbers 3001 to 3099. Two-line dial text without the SCOC line. Tritium MK1 / MK2 matte dial. Some sources estimate the first batch at 50 watches rather than 100; the discrepancy is documented but unresolved.
 
Second batch (glossy dial): approximately 100 to 150 watches, COMEX issue numbers 3100 to 3199. Four-line dial text including SCOC. White-gold-surround applied tritium plots. Glossy MK3 or MK4 print depending on batch position.
 
The COMEX logo prints above 6 o'clock on both batches. The COMEX issue number engraves deep on the caseback exterior — the same format as the 1665 COMEX engravings but on the 16660's revised caseback layout.


A glossy MK3 dial on a 30xx-numbered first-batch case is a signal of a service replacement — Rolex's service network issued replacement dials for the spider-dial generation, and matte-dial COMEX cases occasionally returned from service with the glossy MK3 replacement fitted.
The matte and glossy dials should be compared with the civilian mark, case serial, movement, caseback engraving, and service history. A matte COMEX case with a later glossy service dial is possible. The COMEX name and issue number require provenance; they are not substitutes for examining the watch.


Named COMEX recipients documented in published lots:
Selected records include Phillips Geneva XI lot 128, Christie's COMEX issue 3177, Antiquorum Monaco lot 152, and later Sotheby's professional-diver provenance. These are individual records, not a complete allocation list.


* Bernard Kabrane, COMEX divemaster 1980–1990, specialising in offshore-platform pipeline welding. Full set with 11-link 93160 bracelet and 592 end-links, documented through Menta Watches.
===Tiffany & Co retailer signatures===
* Jacques G., COMEX issue #3153.
* COMEX issue '''#3044''' — case 7,205,232, c. 1981. T<25 matte dial, 93150 / 592 bracelet, cal 3035. Antiquorum Monaco lot 152 on 13 July 2024, estimate EUR 50,000 to 150,000, hammered EUR 118,080. Catalogue grading AAA overall (case grade 8, movement grade 1, dial grade 2).


===Tiffany & Co retailer-signed===
Some 16660 watches are documented with Tiffany & Co retailer signatures on the dial. A retailer signature is a delivery detail, not a separate Rolex reference. The dial, case, movement, and paperwork should agree before treating it as original.


A handful of 16660 examples carry the "Tiffany & Co" co-signature at 6 o'clock on the dial. The retailer-signed branch barely surfaces on the public market — surviving examples sell privately rather than at auction. One documented sale through Tempus in Padua placed an example at approximately USD 50,000. The Tiffany-signed 16660 is the rarest retailer-signed branch in the modern Sea-Dweller line.
===Service replacements===


===Service-replacement signals===
Common service changes include glossy replacement dials on early matte cases, later tritium service dials, replacement crystals, and bracelet or clasp changes. Record the fitted component and its evidence rather than forcing the watch into a single mark label.
 
Glossy MK3 dials on first-batch COMEX matte cases are documented service replacements rather than factory-original configurations. Replacement-dial identification relies on Piccinini's reverse-side analysis — the face print matches but the back-side construction differs from factory-original MK3.


==Auction record==
==Auction record==


The 16660 auction landscape is COMEX-dominated. Standard production examples trade in dealer-market territory rather than at headline-house records.
The records below document individual watches and provenance. Estimates and hammer figures are market history, not a production or value guide.


{| class="wikitable"
{| class="wikitable"
Line 245: Line 158:
! configuration
! configuration
! result
! result
|-
| May 2020
| Phillips Geneva XI, lot 128
| COMEX matte 16660, circa 1982, serial 7'336'314
| hammer CHF 239,400
|-
| May 2015
| Phillips Geneva, lot 112
| COMEX issue 3011, matte dial, serial 7'122'563
| catalogue record
|-
|-
| Jul 2024
| Jul 2024
| Antiquorum Monaco lot 152
| Antiquorum Monaco, lot 152
| COMEX 16660 No. 3044, case 7,205,232, T<25 matte, 93150 / 592
| COMEX issue 3044, matte dial, serial 7'205'232
| EUR 118,080 (estimate EUR 50,000–150,000)
| hammer EUR 118,080
|-
| Jul 2020
| Sotheby's Hong Kong, lot 2225
| COMEX issue 3143, circa 1985
| estimate HKD 480,000–720,000
|-
| Apr 2021
| Sotheby's Hong Kong, lot 2009
| standard Triple Six, circa 1984, serial 8'097'724
| estimate HKD 80,000–120,000
|-
|-
| Oct 2023
| Oct 2023
| Loupe This lot 1799
| online auction record
| 1982 16660 matte, V8.5 grade
| standard matte 16660
| USD 14,135 (estimate USD 10,000–20,000)
| hammer USD 14,135
|-
|-
| —
| May 2009
| Tempus (Padua) private sale
| Artcurial, lot 480
| Tiffany Signed Triple Six
| standard 16660, circa 1984
| approximately USD 50,000
| hammer EUR 4,463
|}
|}


Market bands (2024–2026):
=== Provenance and authentication ===
 
A 16660 should be checked through its case, valve, crystal, bezel, dial, movement, bracelet, serial, and paperwork. COMEX issue numbers and operator histories can support provenance, but a single auction description does not establish every detail of a branch. Claims that a celebrity wore a specific 16660 should be treated as unverified unless a photograph or paper trail identifies the reference. The James Cameron Deepsea Challenge was a different experimental watch, not a 16660.
 
== Related references ==
 
* [[Reference:1665|Sea-Dweller 1665]], Double Red, 'Great White' (1967–1983)
* [[Reference:16600|Sea-Dweller 16600]], Cal 3135 (1989–2008)
* [[Reference:116600|Sea-Dweller 116600]], 2014–2017


* COMEX matte dial — USD 100,000 to 200,000 plus. Provenance lots into the mid six figures.
See also the [[Reference:sea-dweller|Sea-Dweller family index]], [[Reference:Movements|movement reference]], [[Reference:Bracelets|bracelet & clasp guide]], and [[Reference:Serial-numbers|serial numbers by year]].
* COMEX glossy dial — USD 80,000 to 120,000.
* Spider-dial non-COMEX — USD 25,000 to 45,000 for clean honest examples.
* Matte standard non-COMEX — USD 18,000 to 30,000 clean; USD 40,000 plus with full set and paperwork.
* Glossy standard non-COMEX — USD 10,000 to 18,000 typical.
* Tiffany-signed — approximately USD 50,000 known transaction; effectively absent from public sales.


==Sources==
== Sources ==


* ''The Vintage Rolex Field Manual'' — Colin A. White, Morning Tundra
* ''The Vintage Rolex Field Manual'' — Colin A. White, Morning Tundra
* [https://www.rolex.com/watches/sea-dweller Rolex Sea-Dweller], Rolex
* [https://en.wikipedia.org/wiki/Rolex_Sea-Dweller Rolex Sea-Dweller], Wikipedia (chronology cross-check)
* [https://monochrome-watches.com/history-rolex-sea-dweller-saturation-dive-watch-helium-escape-valve-deepsea/ Monochrome Watches editorial, "In-Depth: The History of the Rolex Sea-Dweller", Monochrome, 2025]
* [https://monochrome-watches.com/history-rolex-sea-dweller-saturation-dive-watch-helium-escape-valve-deepsea/ Monochrome Watches editorial, "In-Depth: The History of the Rolex Sea-Dweller", Monochrome, 2025]
* [https://www.hodinkee.com/articles/rolex-sea-dweller-reference-points Hodinkee editorial, "Reference Points: Understanding the Rolex Sea-Dweller", Hodinkee, 2018]
* [https://www.hodinkee.com/articles/rolex-sea-dweller-reference-points Hodinkee editorial, "Reference Points: Understanding the Rolex Sea-Dweller", Hodinkee, 2018]
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[[Category:Sea-Dweller]]
[[Category:Sea-Dweller]]
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Latest revision as of 22:59, 22 September 2026


Sea-Dweller › 16660

Rolex Sea-Dweller 16660 (Triple Six).
Rolex Sea-Dweller 16660 (Triple Six).


The 16660 is the second Sea-Dweller reference and the first to use a sapphire crystal and a 1220m / 4000ft depth rating. It introduced caliber 3035, a quick-set date, a larger helium escape valve, and a unidirectional bezel while retaining the 40mm Oyster case. Rolex introduced it in 1978; production and delivery records run into the late 1980s before the 16600 took over. Matte and glossy tritium dials, plus a COMEX branch, are documented. “Triple Six” is collector shorthand from the reference number; Rolex used “Sea-Dweller 4000” in period material.

Core facts

detail value
reference 16660
family Sea-Dweller 4000
production introduced 1978; production generally dated to 1988, with some 1989 deliveries during the 16600 changeover
movement caliber 3035, 27 jewels, 28,800 vph, quick-set date, hacking seconds, approximately 42–48 hours reserve
case 40mm Oyster case with helium escape valve and Triplock crown
crystal flat sapphire; first sapphire-crystal Sea-Dweller reference
bezel unidirectional revolving bezel with black aluminum insert and 60-minute scale
depth rating 1220m / 4000ft
dial families matte early dials and glossy later dials, all factory-original examples using tritium; collector marks vary by source
COMEX branch documented deliveries around 1980–1984; total and batch boundaries are source-dependent
predecessor 1665, which continued in parallel after the 16660 launch
successor 16600, with caliber 3135 and later production

Where it sits in the line

The 16660 replaced the 1665's acrylic crystal and 610m rating with flat sapphire and a 1220m / 4000ft rating. It also brought caliber 3035 with a quick-set date, a larger helium escape valve, and a unidirectional bezel. The 1665 and 16660 overlap in the late 1970s and early 1980s; the 16600 follows with caliber 3135.

All factory 16660 watches use caliber 3035. Claims that the 16660 received the later 3135 confuse it with the 16600. The 16660 dial and case should be dated separately because matte-to-glossy changes, COMEX deliveries, and service replacements overlap.

Production outline

The 16660 is easiest to describe through its case and dial changes. Rolex did not publish a complete serial-to-dial schedule, and collector marks use different boundaries.

Early matte production, 1978–around 1983

Early watches have matte black tritium dials with painted luminous plots, caliber 3035, sapphire crystal, the revised helium valve, and a unidirectional bezel. Specialist references divide the matte run into several marks, sometimes called MK0 through MK2 or related names. These labels describe dial printing and plot layout; they are not Rolex model variants.

Glossy transition, around 1983–1985

Rolex moved to glossy black dials with applied white-gold surrounds during the early-to-mid 1980s. Some transitional examples overlap, and the change is dated differently by catalogues and observed serials. The early glossy MK3 is associated with spider-style lacquer cracking; later service or replacement dials can be visually similar.

Late glossy production, mid-1980s to late 1980s

Later glossy dials are commonly grouped as MK4, MK4 bis, or MK5 in specialist references. The exact mark names and supplier attributions differ, but all factory-original examples remain tritium marked. The 16600 successor appears in 1989 catalogues while 16660 inventory can still surface with 1989 delivery paperwork.

Movement notes

Caliber 3035 powers the 16660 throughout its run. Published specifications give 27 jewels, 28,800 vph, quick-set date, hacking seconds, and approximately 42–48 hours of reserve depending on the source. The movement is chronometer-rated in the Sea-Dweller context and is the direct successor to the 1575 used in the 1665.

The 3035 has a balance cock rather than the full balance bridge later used on caliber 3135. That difference identifies the movement family, but does not by itself date every part inside a serviced watch. Read the caliber engraving, movement serial, service records, and case serial together.

Dial map

16660 dials are generally divided into an early matte group and a later glossy group. Specialist works use different mark numbers, so the labels below are shorthand rather than a factory register.

Matte dials

Matte black dials have painted tritium plots and the 4000ft / 1220m depth text. Collectors subdivide them into several marks using coronet shape, letter alignment, plot geometry, and the spacing of the lower text. These features are useful only when matched with the case, movement, serial, and provenance.

Glossy dials and spider cracking

Glossy dials use applied white-gold surrounds over tritium plots. Early glossy examples can show lacquer cracking commonly called spider dials. Rolex service replacements and later glossy marks can look similar from the front; reverse-side markings, feet, plot attachment, and service history are stronger evidence than a name such as MK3 or MK4 alone.

Tritium and service dials

Factory 16660 dials are associated with T SWISS T < 25 markings. A later Luminova or Super-LumiNova dial on a 16660 should be recorded as a service or replacement part unless individual evidence proves otherwise. “Frozen” or milky tritium is an ageing description, not a separate factory generation.

Case, bezel, crystal, and crown notes

The 16660 has a 40mm Oyster case, flat sapphire crystal, helium escape valve, Triplock crown, and 1220m / 4000ft rating. The larger valve and sapphire crystal are the principal case changes from the 1665. Rolex describes the 1978 Sea-Dweller as the point at which the line moved to the 4000ft rating.

Caseback and valve

Civilian casebacks carry period Rolex and depth-related engravings; COMEX examples add an external issue number. Internal stamps and serial markings vary by batch. The caseback, valve, crystal, movement, and dial should be assessed together when checking originality.

Bezel

The 16660 uses a unidirectional revolving bezel with a black aluminum insert and 60-minute scale. This differs from the bidirectional 60-unit bezel documented on the 1665. Insert replacement and cross-fitment with other period Rolex divers are possible, so the bezel is not a stand-alone authentication test.

Bracelet, end-links, clasps

Documented fitments include the 93150 and later 93160 Oyster bracelets, with end-link and clasp details varying across the production span. Specialist references commonly associate 380-family links with earlier 93150 examples and 580/592-family links with later configurations, but the individual case and delivery record control.

The Fliplock diver extension is part of the period bracelet system. A clasp or end-link code dates the bracelet, not the watch head. Service bracelets, clasp swaps, and retail-stock overlap can produce a later bracelet on an earlier case.

Special branches

COMEX 16660

COMEX received 16660 watches around 1980–1984. The branch uses a COMEX dial and external issue numbering, with matte and glossy deliveries documented. Specialist sources often describe roughly 200 watches, but the exact total and the split between matte and glossy watches are not settled; one source describes the initial issue range 3001–3099 and later numbers 3100–3199, while auction catalogues give different batch descriptions.

The matte and glossy dials should be compared with the civilian mark, case serial, movement, caseback engraving, and service history. A matte COMEX case with a later glossy service dial is possible. The COMEX name and issue number require provenance; they are not substitutes for examining the watch.

Selected records include Phillips Geneva XI lot 128, Christie's COMEX issue 3177, Antiquorum Monaco lot 152, and later Sotheby's professional-diver provenance. These are individual records, not a complete allocation list.

Tiffany & Co retailer signatures

Some 16660 watches are documented with Tiffany & Co retailer signatures on the dial. A retailer signature is a delivery detail, not a separate Rolex reference. The dial, case, movement, and paperwork should agree before treating it as original.

Service replacements

Common service changes include glossy replacement dials on early matte cases, later tritium service dials, replacement crystals, and bracelet or clasp changes. Record the fitted component and its evidence rather than forcing the watch into a single mark label.

Auction record

The records below document individual watches and provenance. Estimates and hammer figures are market history, not a production or value guide.

date house configuration result
May 2020 Phillips Geneva XI, lot 128 COMEX matte 16660, circa 1982, serial 7'336'314 hammer CHF 239,400
May 2015 Phillips Geneva, lot 112 COMEX issue 3011, matte dial, serial 7'122'563 catalogue record
Jul 2024 Antiquorum Monaco, lot 152 COMEX issue 3044, matte dial, serial 7'205'232 hammer EUR 118,080
Jul 2020 Sotheby's Hong Kong, lot 2225 COMEX issue 3143, circa 1985 estimate HKD 480,000–720,000
Apr 2021 Sotheby's Hong Kong, lot 2009 standard Triple Six, circa 1984, serial 8'097'724 estimate HKD 80,000–120,000
Oct 2023 online auction record standard matte 16660 hammer USD 14,135
May 2009 Artcurial, lot 480 standard 16660, circa 1984 hammer EUR 4,463

Provenance and authentication

A 16660 should be checked through its case, valve, crystal, bezel, dial, movement, bracelet, serial, and paperwork. COMEX issue numbers and operator histories can support provenance, but a single auction description does not establish every detail of a branch. Claims that a celebrity wore a specific 16660 should be treated as unverified unless a photograph or paper trail identifies the reference. The James Cameron Deepsea Challenge was a different experimental watch, not a 16660.

Related references

See also the Sea-Dweller family index, movement reference, bracelet & clasp guide, and serial numbers by year.

Sources

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