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{{DISPLAYTITLE:Rolex Explorer 6610}}
{{#seo:
{{#seo:
|title=Rolex Explorer 6610 — BezelBase
|title=Rolex Explorer 6610 — Cal. 1030, Red-Depth and Off-White Dials | Rolexopedia
|description=The 6610 is the bridge between the earliest Explorers and the long-running 1016. It brings a genuine movement upgrade — calibre 1030, replacing the A296 —…
|description=The Explorer 6610 uses Cal. 1030 in a 36mm steel case. Auction records document red-depth, black gilt and off-white dials, with conflicting published end dates.
|keywords=Rolex, 6610, Explorer, specifications, reference guide
|keywords=Rolex, Explorer, 6610, Cal. 1030, red depth, Albino dial
|image=Ref 6610 hero.webp
|image_alt=Rolex Explorer 6610 with red 50m depth text on its dial
|type=article
|type=article
}}
}}
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<small>[[Reference:explorer|Explorer]] → '''6610'''</small>
<small>[[Reference:explorer|Explorer]] → '''6610'''</small>


The 6610 is the bridge between the earliest Explorers and the long-running 1016. It brings a genuine movement upgrade, calibre 1030 replacing the A296, and settles the Explorer into a more standardized form. Production ran for fewer years than the 1016 that follows it, making the 6610 the scarcer watch by a meaningful margin. It also carries one of the rarest Explorer dials in any reference: the white-dial "Albino." The Vintage Rolex Field Manual calls the 6150 and 6610 "the first real Oyster Perpetual Explorers."
<div class="rp-lead">
[[File:Ref 6610 hero.webp|thumb|center|640px|alt=Rolex Explorer reference 6610 with a black gilt dial and red 50m depth rating|Explorer 6610 with red depth rating]]
</div>


<span id="core-facts"></span>
The Explorer 6610 replaced earlier A296-powered models with Cal. 1030 and a flatter caseback. Published histories agree on a 1955 introduction but differ on the end date: Hodinkee gives 1959, while Monochrome says production stopped in 1963. Auction catalogues document watches dated from 1956 to 1958, including several with red depth text and one off-white dial later called “Albino” by collectors.


[[File:Ref 6610 hero 2.webp|thumb|right|340px|alt=Explorer 6610 — black Officially Certified Chronometer dial|Explorer 6610 — black Officially Certified Chronometer dial]]
==Core facts==


== Core facts ==
{| class="wikitable rp-facts"
 
{| class="wikitable"
|-
|-
! Field
! detail
! Value
! documented information
|-
|-
| Reference
| reference
| 6610
| 6610
|-
|-
| Family
| family
| Explorer
| Explorer
|-
|-
| Production
| production dates
| circa 1955–1963 — start and end dates contested across sources (see Production outline)
| Hodinkee: 1955–1959. Monochrome: introduced in 1955, production ended in 1963. Catalogue dates for individual watches range from 1956 through circa 1958.
|-
| Movement
| calibre 1030
|-
| Case
| 36mm stainless steel, smooth bezel, flatter caseback than 6150
|-
|-
| Crystal
| case
| acrylic
| Stainless steel; auction catalogues measure 35mm (Phillips, 2018) or 36mm (Christie’s and other Phillips lots).
|-
|-
| Dial
| movement
| lacquered black gilt; chapter ring; radium lume
| Cal. 1030 automatic; auction descriptions identify 25 jewels.
|-
|-
| Dial text
| dial forms
| "Explorer," "Officially Certified Chronometer" (OCC)
| Black gilt with “Officially Certified Chronometer” text; red 50m depth print on documented examples; an off-white example known as an “Albino.”
|-
|-
| Seconds hand
| certification evidence
| lollipop (aperture size varies across production)
| Some auction lots include the Officially Certified Chronometer dial wording and Bureau certificate; these are lot-specific records.
|}
|}


<span id="where-it-sits-in-the-line"></span>
==Where it sits in the line==
== Where it sits in the line ==
 
The 6610 followed the early Explorer references 6150 and 6350, using Cal. 1030 where those earlier models used the thicker A296. The 1016 followed it with Cal. 1560. Published chronologies disagree on the handoff date; the [[Reference:explorer|Explorer family index]] gives the Hodinkee 1955–1959 range and notes Monochrome’s 1963 end date.
 
The 6610 shares its movement with contemporary Rolex models, including the Submariner. That shared caliber does not make their case, dial or certification details interchangeable. See the [[Reference:Movements|Movement guide]] for the Cal. 1030 family.
 
==Production outline==
 
Jon Bues’s Hodinkee reference guide dates 6610 production to 1955–1959. Frank Geelen’s Monochrome history also places its introduction in 1955 but says production ended in 1963. Colin White’s ''The Vintage Rolex Field Manual'' says the 6610 replaced the 6150 in 1959; its line does not give a complete production span. These are different published chronologies, not evidence for a documented leftover-stock program.
 
Auction records provide dated examples rather than a complete run. Phillips catalogued red-depth watches with case numbers 113092 and 113174 and inner-back dates in 1956. Other records identify case numbers 113185, 113189 and 114307. Christie’s and Sotheby’s catalogued watches with cases 359502 and 359657 as 1958 examples. A Bonhams 2025 listing dates case 360272 to circa 1958 while recording an inside date code of III.66; both details are retained as the lot’s description.
 
Sotheby’s 2022 tropical-dial listing calls its watch a circa-1955 6610 but gives case number 6197309, far outside the other case numbers cited here. The catalogue does not explain the discrepancy, so that number is not used to date the reference.
 
==Movement notes==
 
Auction records identify Cal. 1030 in the 6610. Phillips and Christie’s list 25 jewels. The caliber replaced the A296 used in the earlier 6150 and 6350; the [[Reference:Movements|Movement guide]] describes its bidirectional winding and butterfly rotor. The slimmer movement also allowed a flatter caseback than the earlier Bubbleback-style case.
 
The dial and certification records should be read together. Christie’s off-white 6610 and Phillips red-depth examples carry “Officially Certified Chronometer” wording; the Phillips lots also include Bureau certificates. These examples document the wording and paperwork for specific watches, not the condition of every surviving dial or movement.
 
==Dial map==


The 6610 succeeds the 6350 and is the direct predecessor to the 1016, which goes on to become one of the longest-produced Explorer references. The Vintage Rolex Field Manual states the 6610 replaced the pre-Explorer ref 6150. The 6610 is the last Explorer to use calibre 1030 before the 1016 transitions to calibre 1560.
Several dial forms are documented. The red-depth examples have the strongest auction record; other forms are tied to a smaller number of published watches.


The Vintage Rolex Field Manual says the 6150 and 6610 are "indistinguishable from one another" except for the movement (A296 vs. 1030) and the flatter caseback on the 6610. The 6150 has a "Bubble back" style case profile; the 6610's caseback is visibly flatter.
===Red 50m depth rating===


<span id="production-outline"></span>
Phillips catalogued red “50m=165ft” dials on 6610s with case numbers 113092 and 113174; Sotheby’s lists another at 113185, and Antiquorum records 113189. Those four lots place the examples in the 113xxx range and date them around 1956. Antiquorum says its research found red-depth examples between 113xxx and 114xxx. These records show where the cited examples fall, not a complete serial census.
== Production outline ==


Production dates for the 6610 are contested. Hodinkee places the run from 1955 to 1959. Monochrome has it starting later, in 1958, and ending in 1963. The Vintage Rolex Field Manual sets the start in 1959 and does not specify an end. The start dates alone span four years, and the three ranges overlap only narrowly. That is an unusually wide spread for a reference that was never a fringe model. Serial-backed evidence would help narrow this down; until then, published date ranges are rough guides, not authority.
Phillips resold the case 113174 watch in two auctions: Watch Auction One in 2015 and Geneva Watch Auction Eight in 2018. Its movement number, case number and 1956 caseback code identify the same watch in both catalogues.


<span id="movement-notes"></span>
===Black gilt without depth text===
== Movement notes ==


The 6610 runs calibre 1030, the key hardware upgrade over the A296 used in the 6150 and 6350. The 1030 provides improved reliability and is a step toward the more modern calibre architecture that Rolex would continue developing through the 1560 in the 1016.
Phillips’s 2018 Geneva lot 146 and Bonhams’s 2024 lot 24 show black gilt dials without the red depth line. The Phillips example has a 3-6-9 layout and an “Officially Certified Chronometer” signature. Bonhams records case 114307, an inside date code of I.56 and a 6636 riveted bracelet.


The Vintage Rolex Field Manual identifies the movement as the primary distinguishing feature between the 6610 and the 6150; the two references are otherwise described as "indistinguishable."
===Off-white “Albino” dial===


<span id="dial-map"></span>
Christie’s catalogued an off-white 6610, case 359502, as made in 1958. The lot description lists Cal. 1030, 25 jewels, luminous markers and hands, and “Officially Certified Chronometer” text. Christie’s specialist essay suggested the unusual dial may have been made to special order; that is the auction house’s view of this example.
== Dial map ==
[[File:Ref 6610 hero.webp|thumb|right|260px|alt=6610 red depth rating dial|6610 red depth rating dial]]


<span id="standard-lacquered-black-gilt-dial"></span>
Hodinkee’s 2023 Albino-dial review reports that the Christie’s watch sold for CHF 171,750 and describes a second 6610 sold by Menta Watches in 2022 with a red depth rating. “Albino” is collector shorthand for the off-white dial; the available records do not establish a total count or a single origin for these dials.
=== Standard lacquered black gilt dial ===


The primary configuration. A black lacquered dial with gilt (gold-coloured) printing, a chapter ring (the thin ring of minute markers at the outer edge of the dial), and an "Officially Certified Chronometer" (OCC) line. Radium lume on the indices and hands, which means the watch contains radioactive material, a conservation and handling consideration for collectors.
===Tropical dial listing===


<span id="early-dials-with-red-50m-depth-printing"></span>
Sotheby’s listed a tropical-brown 6610 in 2022. Its case number, 6197309, conflicts with the serials on other documented 6610s, so the listing is not used as a case-number or production-date anchor. The source does not establish how the dial changed color.
=== Early dials with red "50m" depth printing ===


Early 6610 examples feature a red "50m" depth rating printed on the dial. This marking was later dropped. Some examples carry a gilt depth rating instead of red. The exact timing of the transition from red to no-red (or gilt) has not been pinned down.
Hodinkee and Monochrome also note 6610 examples with different lollipop seconds-hand aperture sizes. The cited auction descriptions do not tie those hand variations to a serial range.


<span id="lollipop-seconds-hand-evolution"></span>
<gallery mode="packed" heights="180">
=== Lollipop seconds hand evolution ===
File:Ref 6610 hero.webp|Red 50m depth-rating dial
File:Ref 6610 dial-detail.webp|Close view of the red depth text
File:Ref 6610 hero 2.webp|Black gilt dial without depth text
</gallery>


The lollipop seconds hand, a circle at the tip of the seconds hand, changes across production. Early examples have a large circle aperture; later examples have a noticeably smaller circle. This is a useful dating detail when examining a specific example, but the transition point has not been mapped to serial ranges.
==Case, bezel, crystal, and crown==


<span id="case-bezel-crystal-crown"></span>
The cited catalogues describe a stainless-steel Oyster case. Christie’s and several Phillips lots give a 36mm diameter; Phillips’s Geneva 8 lot gives 35mm. Monochrome describes an acrylic crystal and a flatter caseback than the A296-powered models. Auction descriptions also record a screw-down caseback and crown on individual watches.
== Case, bezel, crystal, and crown ==


Stainless steel, 36mm, smooth bezel, acrylic crystal: the standard Explorer kit of the era. The distinguishing feature is the caseback. The 6610's is noticeably flatter than the 6150's "Bubble back" profile, and side by side the difference is immediate. The rest of the case construction follows Explorer line norms.
==Bracelets, end links, and clasps==


<span id="bracelets-clasps"></span>
Bracelet records vary by lot. Phillips’s 2018 Geneva example has a riveted Oyster bracelet with end links stamped 64; two other Phillips examples are catalogued with 7206 bracelets and end links stamped 80. Bonhams records a 6636 on its 2024 6610. These are documented fittings, not proof of one reference-wide original-delivery configuration.
== Bracelets, end links, and clasps ==


Bracelet fitment records for the 6610 are incomplete. Some late examples are found on Big Logo bracelets, but whether these are original-delivery configurations or later fitments is not always clear.
Sotheby’s 2019 condition report calls the 78360 bracelet on its case 359657 a later addition from 1976. The report is a direct example of a later bracelet fitted to an earlier watch. Clasp and bracelet codes date the bracelet components, not the watch head.


<span id="special-branches"></span>
[[File:Ref 6610 bracelet.webp|thumb|right|250px|alt=Rolex Explorer 6610 on a riveted Oyster bracelet|A 6610 catalogued with a riveted Oyster bracelet by Bonhams in 2024]]
== Special branches ==


<span id="the-albino-white-dial-6610"></span>
==Auction record==
=== The "Albino" white-dial 6610 ===


The Albino is a white-dial variant of the 6610 that is extremely rare and extremely valuable. Instead of the standard black lacquered dial, the Albino carries a white dial with dark printing. The number of surviving Albino examples is not well documented, and auction appearances are uncommon. When one surfaces, serious vintage collectors take notice.
{| class="wikitable sortable"
|-
! sale
! watch and catalogue details
! result
|-
| Phillips Watch Auction One, lot 167 (2015)
| Red-depth 6610, case 113174, caseback dated I.56; same watch later sold as Geneva Watch Auction Eight lot 95
| CHF 70,000
|-
| Phillips Geneva Watch Auction Eight, lot 95 (2018)
| Red-depth 6610, case 113174; 25 jewels, 36mm, end links 64
| CHF 65,000
|-
| Phillips Hong Kong Watch Auction XV, lot 1055 (2022)
| Red-depth 6610, case 113092, caseback dated I.56; 25 jewels, 36mm
| HK$302,400
|-
| Antiquorum Geneva, lot 493 (2024)
| Red-depth 6610, case 113189; circa 1956
| CHF 31,250
|-
| Bonhams London, lot 24 (2024)
| Black gilt, no-depth 6610, case 114307, caseback dated I.56; 6636 bracelet
| £7,680 including premium
|-
| Christie’s, 6610 off-white dial (2013)
| Case 359502, Cal. 1030, 25 jewels; sale result reported by Hodinkee
| CHF 171,750
|-
| Sotheby’s 2023, Important Watches Part II, lot 290
| Red-depth 6610, case 113185; 25 jewels, circa 1956
| Result not shown
|-
| Bonhams London, lot 26 (2025)
| Catalogued circa 1958, case 360272; inside date code III.66; later 78360 bracelet
| £6,400 including premium
|}
 
==Related references==


How the Albino came to exist is not entirely clear. Whether it was a special order, a limited production variant, or something else has not been documented. An Albino ranks among the rarest Explorers in any reference.
* [[Reference:6150|Explorer 6150]] and [[Reference:6350|Explorer 6350]], earlier Explorer models
* [[Reference:1016|Explorer 1016]], the following long-running reference
* [[Reference:explorer|Explorer family index]]
* [[Reference:Movements|Movement reference]]
* [[Reference:Bracelets|Bracelet & clasp guide]]
* [[Reference:Serial-numbers|Serial numbers by year]]
 
<gallery mode="packed" heights="180">
File:Ref 6610 hero.webp|6610 with red 50m depth rating
File:Ref 6610 dial-detail.webp|Red-depth dial detail
File:Ref 6610 hero 2.webp|Black gilt dial
File:Ref 6610 bracelet.webp|Riveted Oyster bracelet
</gallery>


== Sources ==
== Sources ==
* [https://monochrome-watches.com/history-rolex-explorer-from-1953-36mm-1016-14270-114270-214270-124270-in-depth-review/ The History of the Rolex Explorer, The All-Rounder Watch] — Frank Geelen, Monochrome Watches
 
* [https://www.hodinkee.com/articles/rolex-explorer-reference-points A Comprehensive Collector's Guide To The Rolex Explorer I] — Jon Bues, Hodinkee
* [https://www.hodinkee.com/articles/rolex-explorer-reference-points Jon Bues, “A Comprehensive Collector’s Guide to the Rolex Explorer I,” Hodinkee] — 1955–1959 chronology, dial and hand variants.
* [https://www.bobswatches.com/rolex-blog/rolex-info/rolex-explorer.html Rolex Explorer Guide] — Bob's Watches editorial, Bob's Watches
* [https://monochrome-watches.com/history-rolex-explorer-from-1953-36mm-1016-14270-114270-214270-124270-in-depth-review/ Frank Geelen, “The History of the Rolex Explorer,” Monochrome Watches] — 1955 introduction, 1963 end date, movement and case overview.
* The Vintage Rolex Field Manual — Morning Tundra, unknown
* [https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf Colin A. White, ''The Vintage Rolex Field Manual''] — places the 6610/6150 handoff in 1959.
* [https://www.phillips.com/detail/rolex/CH080215/167 Phillips Watch Auction One, lot 167 (2015)] — red-depth case 113174 and result.
* [https://www.phillips.com/detail/rolex/CH080218/95 Phillips Geneva Watch Auction Eight, lot 95 (2018)] — red-depth case 113174, date code, dimensions, bracelet and result.
* [https://www.phillips.com/detail/rolex/CH080218/146 Phillips Geneva Watch Auction Eight, lot 146 (2018)] — black gilt dial without depth text.
* [https://www.phillips.com/detail/rolex/HK080222/1055 Phillips Hong Kong Watch Auction XV, lot 1055 (2022)] — red-depth case 113092, date code, movement and result.
* [https://catalog.antiquorum.swiss/en/lots/rolex-ref-6610-explorer-lot-368-493 Antiquorum Geneva, lot 493 (2024)] — red-depth case 113189 and result.
* [https://www.bonhams.com/auction/29152/lot/24/ Bonhams London, lot 24 (2024)] — black gilt dial, case 114307, date code and fitted bracelet.
* [https://www.bonhams.com/auction/30669/lot/26/ Bonhams London, lot 26 (2025)] — case 360272, circa date, inside date code and later bracelet.
* [https://www.christies.com/en/lot/lot-5674570 Christie’s, off-white 6610, case 359502 (2013)] — dial, case, movement and Christie's specialist’s special-order opinion.
* [https://www.hodinkee.com/articles/whats-the-deal-with-albino-rolex-dials “Everything You Need to Know About Rolex Albino Dials,” Hodinkee] — Christie’s result and a later red-depth off-white example.
* [https://www.sothebys.com/en/auctions/ecatalogue/2019/important-watches-ge1904/lot.315.html Sotheby’s Geneva, lot 315 (2019)] — case 359657 and later-added 78360 bracelet.
* [https://www.sothebys.com/buy/61253a88-2fd2-4e46-9101-c27f35b3f682/lots/a5485039-0337-4a40-984e-a6e9d0e4ca6a Sotheby’s, Important Watches Part II, lot 290 (2023)] — red-depth case 113185.
* [https://www.sothebys.com/en/buy/auction/2022/fine-watches-2/reference-6610-explorer-a-stainless-steel Sotheby’s, tropical-dial 6610 (2022)] — catalogue’s circa-1955 date and case number 6197309.


[[Category:Explorer]]
[[Category:Explorer]]
[[Category:Working Draft]]
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