Admin: Update Kew A totals with 1953 Rolex advertisement evidence

2026-10-09T11:00:52Z

Update Kew A totals with 1953 Rolex advertisement evidence

← Older revision		Revision as of 11:00, 9 October 2026
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	==Where it sits in the line==		==Where it sits in the line==

	The 6210 was the gold-cased part of Rolex’s Kew A wristwatch program. Sources describe 136 certified movements, with 112 used in steel ref. 5056 Speedkings and 24 in gold 6210s. ~~Christie's instead~~ says ~~136~~ movements ~~were submitted;~~ James Dowling’s account, repeated by Hodinkee, and Vetroplastica give 145 submitted, 9 unsuccessful, and 136 certified. ~~Those~~ totals describe the wider test program, ~~not~~ 6210 ~~production alone~~.		The 6210 was the gold-cased part of Rolex’s Kew A wristwatch program. Sources describe 136 certified movements, with 112 used in steel ref. 5056 Speedkings and 24 in gold 6210s. A 1953 Rolex advertisement reproduced by Marco Strazzi says 140 movements had qualified for and received the certificate. James Dowling’s account, repeated by Hodinkee, and Vetroplastica give 145 submitted, 9 unsuccessful, and 136 certified; Christie’s says 136 were submitted. The published totals conflict. They describe the wider test program, while the 24-watch 6210 allocation is a separate reported figure.

	==Production outline==		==Production outline==
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	* [https://www.uhrenkosmos.com/rolex-meilensteine-1952-bis-1955-wegweisend/ Uhrenkosmos editorial, "Rolex milestones 1952–1955 — Kew A Observatory Chronometer", Uhrenkosmos, 2026-01-02]		* [https://www.uhrenkosmos.com/rolex-meilensteine-1952-bis-1955-wegweisend/ Uhrenkosmos editorial, "Rolex milestones 1952–1955 — Kew A Observatory Chronometer", Uhrenkosmos, 2026-01-02]
	* [https://ci.nii.ac.jp/ncid/BA30937230 ''The Best of Time: Rolex Wristwatches: An Unauthorized History'' — James M. Dowling and Jeffrey P. Hess, Schiffer Publishing, 1996]		* [https://ci.nii.ac.jp/ncid/BA30937230 ''The Best of Time: Rolex Wristwatches: An Unauthorized History'' — James M. Dowling and Jeffrey P. Hess, Schiffer Publishing, 1996]
			* [https://www.10e10.ch/2022/03/vintage-ads-rolex-1953.html Marco Strazzi, "Rolex advertisement on Kew A results, reproduced by 10e10.ch", 10e10.ch, 1953 (advertisement); 2022-03-14 (reproduction and transcription)]

	[[Category:Oyster]]		[[Category:Oyster]]

Admin: Import reference 6210 article

2026-10-09T10:29:56Z

Import reference 6210 article

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{{DISPLAYTITLE:Rolex Oyster Observatory Chronometer 6210}}
{{#seo:
|title=Rolex Oyster Observatory Chronometer 6210 — Kew A Reference | Rolexopedia
|description=Evidence-based guide to Rolex ref. 6210: the gold Kew A Oyster, its movement, dial records, case details, and auction examples.
|keywords=Rolex 6210, Kew A, Rolex Observatory Chronometer, Rolex Cal. 700, Rolex 5056
|image=Ref 6210 hero.webp
|image_alt=18K gold Rolex ref. 6210 with a silvered dial, subsidiary seconds, and Kew A Certificate text
|type=Article
|og_type=article
|robots=index,follow,max-image-preview:large
}}

<small>Oyster → '''6210'''</small>

<div class="rp-lead">
[[File:Ref 6210 hero.webp|thumb|center|640px|alt=18K gold Rolex ref. 6210 with a silvered dial, subsidiary seconds, and Kew A Certificate text|Bonhams, 2018, lot 22.]]
</div>

The Rolex Oyster Observatory Chronometer ref. 6210 is a 34–35 mm, 18K-gold, hand-wound Oyster with subsidiary seconds. Documented Kew A movements are signed “Rolex Kew A Tested”; standard dials carry Observatory and Kew A wording. Bonhams identifies a 2024 example’s dial as a reprint without those inscriptions. Published accounts report 24 gold-cased examples, associated with 1954.

==Core facts==

{| class="wikitable rp-facts"
|-
! Detail
! Record
|-
| Model
| Oyster Observatory Chronometer
|-
| Case
| 18K yellow gold, screw-down caseback and crown
|-
| Diameter
| Auction catalogues give 34 or 35 mm
|-
| Movement
| Manual wind, 10½ lignes; caliber naming varies by source
|-
| Display
| Hours, minutes, subsidiary seconds
|-
| Date
| No date
|-
| Reported gold production
| 24 watches, cased or released in 1954
|-
| Related Kew A reference
| Steel Oyster Speedking 5056
|}

==Where it sits in the line==

The 6210 was the gold-cased part of Rolex’s Kew A wristwatch program. Sources describe 136 certified movements, with 112 used in steel ref. 5056 Speedkings and 24 in gold 6210s. Christie's instead says 136 movements were submitted; James Dowling’s account, repeated by Hodinkee, and Vetroplastica give 145 submitted, 9 unsuccessful, and 136 certified. Those totals describe the wider test program, not 6210 production alone.

==Production outline==

The movements were tested before they were cased. Christie's dates movement 4162 to 1948 and says it was cased and sold in 1954. Bonhams dates movement 4156’s Kew A pass to 6 April 1951; Uhrenkosmos also places the 6210 release in 1954. Auction listings date individual examples circa 1951 and circa 1955; those are lot estimates, not evidence of separate production runs or the endpoints of the 6210 series.

Vetroplastica lists 1949–1951 for both the steel 5056 and gold 6210, alongside the later casing date reported by Christie's and Dowling. Its table does not say whether the range dates movement production, testing, or finished watches.

Published accounts report 24 gold watches. Hodinkee attributes the number to James Dowling, who said Rolex confirmed production and case numbers in a letter; Christie's cites Dowling and Hess’s ''The Best of Time''. Specialist sites repeat the figure. The accessible sources report this correspondence but do not reproduce the Rolex records.

==Movement notes==

The 6210 is manual wind, with a 10½-ligne movement signed “Rolex Kew A Tested.” Christie’s calls the movement Cal. 10.5; Uhrenkosmos describes it as a selected Cal. 700; Vetroplastica says it uses a Cal. 700 base with some Cal. 720 components. Bonhams calls individual 6210 movements Cal. 720. The Movements page lists generic Cal. 720 as automatic; keep the auction label attached to its lot until factory records clarify the Kew movement name.

The trial movements differ in present condition. Bonhams reports that the balance in movement 4156 had been changed. Koller says movement 4160 later received a new balance and balance cock; its 2026 listing describes movement 4185 with its original Guillaume compensation balance and polished, bevelled steel cock.

<gallery mode="packed" heights="180">
File:Ref 6210 movement.webp|Bonhams 2018, lot 22: movement 4156.
File:Ref 6210 movement-2.webp|Bonhams 2024, lot 19: movement 4161.
</gallery>

==Dial map==

The documented silvered dials have applied markers and subsidiary seconds at six. Christie's describes applied gold Arabic numerals; Antiquorum and Bonhams describe baton markers. The Kew A dial wording includes “Observatory Chronometer” and “Kew A Certificate,” with the latter printed in red on the Bonhams 2018 example.

Bonhams’ 2024 watch has a reprinted dial. It reads “Rolex Oyster Chronometer” without “Observatory” or “Kew A Certificate.” Bonhams identifies it as a reprint, so it belongs under later dial condition rather than factory variants.

<gallery mode="packed" heights="180">
File:Ref 6210 hero.webp|Bonhams 2018, lot 22: silver dial with Kew A wording.
File:Ref 6210 dial-variant-reprinted.webp|Bonhams 2024, lot 19: reprinted dial without the Kew A text.
</gallery>

Hand descriptions also vary by lot. Antiquorum records yellow-gold dauphine hands; Bonhams 2018 describes gilt dagger hands with luminous inserts; its 2024 reprint example has gilt lance hands. The available examples show three hand descriptions without a production sequence.

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

The catalogued diameter ranges from 34 to 35 mm. Christie's calls the case circular and water-resistant; Antiquorum describes a three-body case with an inverted bezel and concave lugs; Bonhams calls its examples tonneau-form. Catalogues differ in their case terminology and do not establish separate case designs. They describe a screw-down caseback and crown. Crystal material is not consistently reported.

==Bracelets, end links, clasps, and packaging==

Auction records mostly show the 6210 on leather. Koller’s 2025 listing describes a Bucherer gold bracelet as an alternative to a leather strap on one sale watch; factory supply and original fitment remain unproved. The cited records give no verified bracelet reference, end-link number, or clasp code.

Bonhams’ 2024 lot lists a Rolex box as an accompaniment. That record gives no evidence that the box was made for the 6210 or accompanied it at original sale.

==Historical market and auction record==

The table lists six auction appearances through June 2026. Five case numbers are visible; Bonhams masks the last two digits in its 2018 record, so that lot may overlap with another sale. Koller’s 2025 catalogue says four examples had been offered; its 2026 listing says five before the current sale. Six listings do not establish six individual watches.

{| class="wikitable"
|-
! Sale
! Case / movement
! Record
|-
| Christie's Geneva, 16 Nov 2009, lot 188
| 97'461 / 4162
| 34 mm; applied gold Arabic numerals; catalogue dates movement to 1948 and casing to 1954
|-
| Antiquorum Geneva, 27 Mar 2011, lot 108
| 97476 / 4157
| 34 mm; baton markers; dauphine hands
|-
| Bonhams London, 12 Dec 2018, lot 22
| 974** / 4156
| 35 mm; Kew A dial; balance reported changed
|-
| Bonhams, 12 Dec 2024, lot 19
| 97473 / 4161
| 35 mm; reprinted dial; Rolex box listed
|-
| Koller Zurich, 24 Jun 2025, lot 2860
| 97457 / 4160
| 35 mm; later balance and balance cock; Bucherer gold bracelet listed as an alternative
|-
| Koller Zurich, 23 Jun 2026, lot 2860
| 97463 / 4185
| 35 mm; Kew A dial; Guillaume balance and polished, bevelled cock described as original
|}

The numbers above are reported as case numbers. James Dowling’s 6210 is reported as case 97458, described in his letter as the fourth gold-cased watch. The five-digit numbers fall outside the six-digit ranges in generic serial charts. Published records do not map them to those charts.

==Gallery==

<gallery mode="packed" heights="180">
File:Ref 6210 hero.webp|Bonhams 2018, lot 22: full dial and case.
File:Ref 6210 dial-variant-reprinted.webp|Bonhams 2024, lot 19: reprinted dial.
File:Ref 6210 movement.webp|Bonhams 2018, lot 22: movement 4156.
File:Ref 6210 movement-2.webp|Bonhams 2024, lot 19: movement 4161.
</gallery>

== Sources ==

* [https://www.christies.com/en/lot/lot-5257637 "Rolex ref. 6210 Oyster Observatory Chronometer "Kew A Certificate", 18K gold — Christie's Geneva, 16 Nov 2009, lot 188", Christie's, 2009-11-16]
* [https://www.bonhams.com/auction/24632/lot/22/rolex-an-extremely-rare-18k-gold-manual-wind-wristwatch-with-kew-a-certification-rolex-oyster-observatory-chronometer-ref-6210-circa-1951/ "Rolex ref. 6210 Oyster Observatory Chronometer, Kew A, 18K gold — Bonhams, 12 Dec 2018", Bonhams, 2018-12-12]
* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-249-108 "Rolex ref. 6210 "Kew A Certificate", First Series, 18K gold — Antiquorum Geneva, 27 Mar 2011, lot 108", Antiquorum, 2011-03-27]
* [https://www.bonhams.com/auction/29155/lot/19/rolex-an-extremely-rare-18k-gold-kew-a-manual-wind-wristwatch-rolex-oyster-observatory-chronometer-ref-6210-circa-1955/ Bonhams, "Bonhams sale 29155, Lot 19 — Rolex 18K gold Kew A manual wind wristwatch, Oyster Observatory Chronometer, ref. 6210, circa 1955", Bonhams, 2024-12-12]
* [https://www.hodinkee.com/articles/the-rolex-kew-a-quite-possibly-and-very-likely-the-most-accu Eric Wind, "The Rolex Kew A: Quite Possibly (And Very Likely) The Most Accurate Vintage Rolexes Ever Made", Hodinkee, 2011-04-25]
* [https://www.gazette-drouot.com/lots/29543783-rolex-extremement-rare-chronometre--- Koller Auktionen, "Koller Auktionen, Watches A213, lot 2860 — Rolex ref. 6210, case 97457", Koller Auktionen, 2025-06-24]
* [https://www.gazette-drouot.com/lots/33871755-rolex-chronometre-d-observatoire--- Koller Auktionen, "Koller Auktionen, Watches A217, lot 2860 — Rolex ref. 6210, case 97463", Koller Auktionen, 2026-06-23]
* [https://www.vetroplastica.it/rolex-kew-a-18.html Vetroplastica, "Vetroplastica — Rolex Kew A reference and movement overview", Vetroplastica]
* [https://www.uhrenkosmos.com/rolex-meilensteine-1952-bis-1955-wegweisend/ Uhrenkosmos editorial, "Rolex milestones 1952–1955 — Kew A Observatory Chronometer", Uhrenkosmos, 2026-01-02]
* [https://ci.nii.ac.jp/ncid/BA30937230 ''The Best of Time: Rolex Wristwatches: An Unauthorized History'' — James M. Dowling and Jeffrey P. Hess, Schiffer Publishing, 1996]

[[Category:Oyster]]

Reference:6210 - Revision history

Admin: Update Kew A totals with 1953 Rolex advertisement evidence

Admin: Import reference 6210 article