Reference:6510 - Revision history

Klaudiusz: Attribute 6611 steel-run and remove market phrasing

2026-09-29T07:27:07Z

Attribute 6611 steel-run and remove market phrasing

← Older revision		Revision as of 07:27, 29 September 2026
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	===Antiquorum Geneva, Exceptional Horological Works of Art, 19 October 2002, Lot 37===		===Antiquorum Geneva, Exceptional Horological Works of Art, 19 October 2002, Lot 37===
	[[File:Ref 6510 ecole horlogerie 6611 steel.webp\|thumb\|right\|300px\|alt=Rolex Day-Date 6611 in stainless steel, the École d'Horlogerie de Genève prize-watch run. Caseback engraved "Ecole d'Horlogerie de Genève – 1963" with the Rolex crown. ~~One of only~~ six ~~such~~ steel ~~6611s produced~~.\|6611 steel, École d'Horlogerie de Genève prize watch, c.1959, caseback engraved 1963. Antiquorum Geneva, 19 October 2002, Lot 37, CHF 50,600 hammer against CHF 25-30k estimate.]]		[[File:Ref 6510 ecole horlogerie 6611 steel.webp\|thumb\|right\|300px\|alt=Rolex Day-Date 6611 in stainless steel, the École d'Horlogerie de Genève prize-watch run. Caseback engraved "Ecole d'Horlogerie de Genève – 1963" with the Rolex crown. Antiquorum describes the run as six stainless-steel examples.\|6611 steel, École d'Horlogerie de Genève prize watch, c.1959, caseback engraved 1963. Antiquorum Geneva, 19 October 2002, Lot 37, CHF 50,600 hammer against CHF 25-30k estimate.]]


	6611 stainless steel, École d'Horlogerie de Genève prize watch. Caseback engraved "Ecole d'Horlogerie de Genève – 1963" with the Rolex crown logo. ~~The lot is~~ one of ~~only~~ six stainless-steel ~~Day-Dates Rolex ever produced, a marketing-test~~ run ~~donated~~ as ~~prize watches to top~~ École d'Horlogerie ~~graduates, with~~ the ~~school distribution completed by~~ 1963 ~~(hence~~ the ~~engraving year)~~. The lot card lists "circa 1959" for case production with the 1963 engraving for the school dedication; caliber listed as "1556, 26 jewels, Breguet balance spring" (a known Antiquorum cataloguing imprecision, since the underlying movement is the cal 1055B with Breguet overcoil and free-sprung Microstella). 36mm tonneau case fitted to a stainless-steel Oyster bracelet. Estimate CHF 25,000-30,000; hammer CHF 50,600. The cited lot is one documented example; the other five are not identified in the cited public record.		6611 stainless steel, École d'Horlogerie de Genève prize watch. Caseback engraved "Ecole d'Horlogerie de Genève – 1963" with the Rolex crown logo. Antiquorum describes the watch as one of six stainless-steel 6611 examples and says the small run was distributed as prizes by the École d'Horlogerie de Genève; the 1963 engraving dates the presentation, not the case manufacture. The lot card lists "circa 1959" for case production with the 1963 engraving for the school dedication; caliber listed as "1556, 26 jewels, Breguet balance spring" (a known Antiquorum cataloguing imprecision, since the underlying movement is the cal 1055B with Breguet overcoil and free-sprung Microstella). 36mm tonneau case fitted to a stainless-steel Oyster bracelet. Estimate CHF 25,000-30,000; hammer CHF 50,600. The cited lot is one documented example; the other five are not identified in the cited public record.

	===Auction context for 6510 specifically===		===Auction context for 6510 specifically===
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	The sources here contain two direct 6510 entries and several adjacent-reference comparables. They do not provide a complete auction census, production total, or reliable market history for the reference.		The sources here contain two direct 6510 entries and several adjacent-reference comparables. They do not provide a complete auction census, production total, or reliable market history for the reference.

	Two direct 6510 lots have surfaced at Antiquorum. "100 Years of Wristwatches," Geneva, 19 November 2000, Lot 258, sold a complete 18k pink-gold 6510: tonneau-shaped three-body case, matte silver dial with applied pink-gold indexes, radium-coated baton hands, cal. 1055. Estimate CHF 8,000-10,000; hammer CHF 12,075. It is ~~the clearest~~ documented ~~example of the~~ pink-gold case ~~option described above~~. A second lot, New York, 30 September 2015, Lot 153, sold a bare cal. 1055 movement with dial and hands, catalogued jointly as "Ref. 6510/6511" because the movement alone cannot fix which case it came from; sold USD 2,500 against a USD 2,000-3,000 estimate. ~~That~~ joint cataloguing is itself ~~a small data point on how closely~~ the two references ~~share their internals~~.		Two direct 6510 lots have surfaced at Antiquorum. "100 Years of Wristwatches," Geneva, 19 November 2000, Lot 258, sold a complete 18k pink-gold 6510: tonneau-shaped three-body case, matte silver dial with applied pink-gold indexes, radium-coated baton hands, cal. 1055. Estimate CHF 8,000-10,000; hammer CHF 12,075. It is a documented pink-gold case example. A second lot, New York, 30 September 2015, Lot 153, sold a bare cal. 1055 movement with dial and hands, catalogued jointly as "Ref. 6510/6511" because the movement alone cannot fix which case it came from; sold USD 2,500 against a USD 2,000-3,000 estimate. The joint cataloguing reflects that a loose movement cannot by itself distinguish the two case references.

	==Originals-era cluster, complete sub-reference roster==		==Originals-era cluster, complete sub-reference roster==

Klaudiusz: Remove unsupported market and superlative language from 6510 audit

2026-09-29T07:26:43Z

Remove unsupported market and superlative language from 6510 audit

Admin: Correct early Day-Date bracelet chronology and qualify fitment claims

2026-09-23T03:33:57Z

Correct early Day-Date bracelet chronology and qualify fitment claims

← Older revision		Revision as of 03:33, 23 September 2026
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	{{#seo:		{{#seo:
	\|title=Rolex 6510 Day-Date, The Original 1956 Day-Date, Huguenin Patent, Jubilee Bracelet \| Rolexopedia		\|title=Rolex 6510 Day-Date, The Original 1956 Day-Date, Huguenin Patent, Jubilee Bracelet \| Rolexopedia
	\|description=The 6510 is the first cataloged Day-Date, Basel 1956 launch, caliber 1055, 36mm 18k gold Oyster on Jubilee bracelet, smooth/domed bezel. Marc Huguenin's CH 322341A + CH 323982A patents for the day-of-week complication. ~~Single~~-~~year~~ run ~~before the 6611 introduces~~ the President bracelet ~~in 1957~~.		\|description=The 6510 is the first cataloged Day-Date, Basel 1956 launch, caliber 1055, 36mm 18k gold Oyster on Jubilee bracelet, smooth/domed bezel. Marc Huguenin's CH 322341A + CH 323982A patents for the day-of-week complication. Short first-generation run; Rolex dates the President bracelet to the 1956 launch, while surviving early fitments vary.
	\|keywords=Rolex 6510, Day-Date, Huguenin patent, cal 1055, cal 1055B, Jubilee bracelet, Basel 1956, originals era, 6611, 6612, 6613, 6611B, 6612B, Microstella, SCOC		\|keywords=Rolex 6510, Day-Date, Huguenin patent, cal 1055, cal 1055B, Jubilee bracelet, Basel 1956, originals era, 6611, 6612, 6613, 6611B, 6612B, Microstella, SCOC
	\|image=Ref 6510 hero.webp		\|image=Ref 6510 hero.webp
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	</div>		</div>

	The 6510 is the first Day-Date reference, and is widely credited with being the first wristwatch to display the day of the week in full beside the date. Marc Huguenin's 1950 and 1955 Swiss patent filings describe the mechanism, and Rolex presented the Day-Date at the Basel Fair in 1956. Early 6510 and 6511 examples are documented on Jubilee bracelets~~; the President bracelet appears with the 6611 in 1957~~. Rolex~~'s current material~~ dates the President ~~bracelet's design~~ to the 1956 launch, ~~so “first fitment” should be read from surviving watches~~ and ~~period accounts rather than from~~ the ~~later marketing history~~. The Day-Date was already being called “President” in some material by the late 1950s; the Lyndon B. Johnson campaign helped make that name familiar, rather than creating it from nothing.		The 6510 is the first Day-Date reference, and is widely credited with being the first wristwatch to display the day of the week in full beside the date. Marc Huguenin's 1950 and 1955 Swiss patent filings describe the mechanism, and Rolex presented the Day-Date at the Basel Fair in 1956. Early 6510 and 6511 examples are documented on Jubilee bracelets. Rolex dates the President bracelet’s creation and unveiling to the 1956 launch; Phillips also catalogs a 1955-dated 6511 with a President bracelet and clasp stamped 2.57. The clasp date belongs to that component, and the auction entry does not establish original delivery. The 6611 is strongly associated with early President fitment, but the surviving record does not prove it was first. The Day-Date was already being called “President” in some material by the late 1950s; the Lyndon B. Johnson campaign helped make that name familiar, rather than creating it from nothing.

	==Core facts==		==Core facts==
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	\|-		\|-
	\| bracelet		\| bracelet
	\| Jubilee~~, the only Day-Date reference to launch~~ on ~~Jubilee~~		\| Jubilee bracelets are documented on surviving examples; original delivery is not settled for every watch
	\|-		\|-
	\| earliest documented serial		\| earliest documented serial
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	The 6510 opens the Day-Date line at Basel 1956. The watch displays the day of the week in full at twelve and the date at three. Huguenin's 1950 precursor and 1955 Swiss filings document the mechanism: CH 322341A covers the instant-change date system, while CH 323982A describes the day-date calendar arrangement. The later Day-Date family retains the same basic calendar concept, but these patents do not by themselves prove that every later caliber uses identical parts.		The 6510 opens the Day-Date line at Basel 1956. The watch displays the day of the week in full at twelve and the date at three. Huguenin's 1950 precursor and 1955 Swiss filings document the mechanism: CH 322341A covers the instant-change date system, while CH 323982A describes the day-date calendar arrangement. The later Day-Date family retains the same basic calendar concept, but these patents do not by themselves prove that every later caliber uses identical parts.

	The originals-era cluster (6510 / 6511 / 6611 / 6612 / 6613 / 6611B / 6612B) runs from 1956 through 1959 before the 1803 era replaces it. Within the cluster, the 6510 is the smooth-bezel original; the 6511 launches alongside with the fluted bezel that becomes the Day-Date signature; the 6611 ~~in 1957 introduces~~ the President bracelet and ~~the upgraded cal 1055B~~; the 6612 is the smooth-bezel sibling of the 6611; the 6613 carries a factory gem-set bezel; the 6611B and 6612B are late-1958/1959 movement-plate-revision variants with a bridge plate approximately 0.1mm thicker than the standard 6611/6612.		The originals-era cluster (6510 / 6511 / 6611 / 6612 / 6613 / 6611B / 6612B) runs from 1956 through 1959 before the 1803 era replaces it. Within the cluster, the 6510 is the smooth-bezel original; the 6511 launches alongside with the fluted bezel that becomes the Day-Date signature; the 6611 follows with the upgraded cal 1055B; Rolex dates the President bracelet to the 1956 Day-Date launch, and auction listings document President fitment on a 6511 by 1957; the 6612 is the smooth-bezel sibling of the 6611; the 6613 carries a factory gem-set bezel; the 6611B and 6612B are late-1958/1959 movement-plate-revision variants with a bridge plate approximately 0.1mm thicker than the standard 6611/6612.

	Published ~~vintage~~ accounts ~~place the first-generation~~ 6510 and 6511 on Jubilee bracelets with ~~cal~~. ~~1055~~. The 6611 ~~brings~~ the President bracelet and the upgraded cal. 1055B into the reference sequence. Specialist and auction sources describe the 1055B as the first Day-Date movement with the free-sprung Microstella balance and the “Superlative Chronometer Officially Certified” dial wording; the exact transition of individual parts should still be checked watch by watch.		Published accounts commonly show early 6510 and 6511 watches on Jubilee bracelets. Rolex says the President bracelet was created for the Day-Date and unveiled at the 1956 launch. Phillips catalogues a 1955-dated 6511 with a President bracelet and a clasp stamped 2.57; the stamp dates the bracelet, not the watch head. The surviving records do not establish the bracelet fitted to every 6510 or 6511 at delivery. The 6611 is strongly associated with the President bracelet and the upgraded cal. 1055B.

	==Production outline==		==Production outline==
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	The 6510 and 6511 launch in parallel as a bezel-finish pair. The 6510 carries a smooth or domed bezel in polished gold; specialist literature distinguishes "domed" from "smooth" by the degree of crown radius on the bezel face, with production-period 6510 bezels reading smooth-and-polished, sometimes with a subtle dome that catches reflected light. The 6511 carries the fluted bezel, the radial-flute pattern that becomes the Day-Date signature for the next seventy years.		The 6510 and 6511 launch in parallel as a bezel-finish pair. The 6510 carries a smooth or domed bezel in polished gold; specialist literature distinguishes "domed" from "smooth" by the degree of crown radius on the bezel face, with production-period 6510 bezels reading smooth-and-polished, sometimes with a subtle dome that catches reflected light. The 6511 carries the fluted bezel, the radial-flute pattern that becomes the Day-Date signature for the next seventy years.

	===President bracelet ~~introduction (1957, 6611)~~===		===The President bracelet in early Day-Date records===
	[[File:Ref 6510 6611 president bracelet.webp\|thumb\|right\|300px\|alt=Rolex Day-Date 6611 with the original 1957 President bracelet, three-link semi-circular construction, made by Gay Frères on contract to Rolex.\|6611 with the original 1957 President bracelet, three-link semi-circular construction. ~~The first reference to wear~~ the bracelet Rolex designed specifically for the Day-Date.]]		[[File:Ref 6510 6611 president bracelet.webp\|thumb\|right\|300px\|alt=Rolex Day-Date 6611 with the original 1957 President bracelet, three-link semi-circular construction, made by Gay Frères on contract to Rolex.\|6611 with the original 1957 President bracelet, three-link semi-circular construction. An early example of the bracelet Rolex designed specifically for the Day-Date.]]


	~~The 6611 launches in 1957 with~~ the ~~first~~ President ~~bracelet: three~~-~~link semi-circular construction, made initially by Gay Frères on contract~~ to ~~Rolex (Rolex acquired Gay Frères in 1998)~~. The ~~President~~ is ~~the first bracelet Rolex designed specifically for a single reference and the first three-link semi-circular bracelet in the Rolex catalogue. Early-period~~ President ~~construction uses folded centre links with bark-textured or brushed accent~~, ~~structurally distinct from the solid-link Presidents that arrive on later 1803 / 18038 production. The early clasp is~~ a ~~folded buckle~~-~~style closure~~ with ~~visible Rolex coronet signature~~. The ~~hidden Crownclasp (concealed under a flip-down decorative cover) is a later 1803-era development and~~ does not ~~appear on production-period 6611s~~; ~~concealed clasps fitted to documented 6611 / 6612 examples are later service refits~~.		Rolex dates the President bracelet’s creation for the Day-Date and its unveiling to the model’s 1956 launch. The 6611 is closely associated with early President production, but Phillips also catalogues a 1955-dated 6511 with a President bracelet and clasp stamped 2.57. The auction record does not establish factory delivery for that watch or for every 6511. Early bracelet links and clasps vary; use the [[Reference:Bracelets\|bracelet guide]] and date each bracelet as a separate component.

	===Caliber upgrade (1957, cal 1055B)===		===Caliber upgrade (1957, cal 1055B)===
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	Early 6510 examples are documented on five-link Jubilee bracelets, made for Rolex by Gay Frères and related suppliers. The Jubilee had already been used on the 1945 Datejust, so its appearance on the first Day-Date fits the period's bracelet allocation.		Early 6510 examples are documented on five-link Jubilee bracelets, made for Rolex by Gay Frères and related suppliers. The Jubilee had already been used on the 1945 Datejust, so its appearance on the first Day-Date fits the period's bracelet allocation.

	~~The President bracelet appears in the reference sequence with the 6611 in 1957.~~ Rolex~~'s current brochure~~ dates the bracelet~~'s design~~ to the 1956 Day-~~Date launch~~, so the ~~design date~~ and the ~~first surviving reference fitments should be kept separate. A period-correct 6510 is normally expected on Jubilee~~; ~~a later President bracelet may be a service or owner change~~.		Rolex dates the President bracelet to the Day-Date’s 1956 launch. The auction record documents both Jubilee and President bracelets on early Day-Dates, including Phillips’s 1955-dated 6511 with a 2.57 President clasp. That evidence does not prove which bracelet accompanied every 6510 when new. Compare the bracelet and clasp on the individual watch; their dates do not date the head.

	~~Documented~~ 6510 examples ~~occasionally appear on~~ later ~~President bracelets; these are service refits~~ or ~~owner-led modifications~~. ~~Period-correct 6510 fitment is~~ the ~~Jubilee~~. ~~Clasp date codes inside the Jubilee~~ clasp ~~leaf are~~ the ~~dating anchor~~, ~~and clasps far ahead or behind~~ the case ~~serial typically indicate later service-replacement bracelets~~.		Published 6510 examples include Jubilee bracelets, and other surviving heads may carry later replacements or period changes. Do not infer original delivery from the reference or from the bracelet style alone. A clasp code dates the bracelet component, not the case.

	==Auction record==		==Auction record==
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	\| 1957–59		\| 1957–59
	\| fluted		\| fluted
	\| President (~~first reference~~)		\| President (strongly associated; earlier fitment documented on a 6511)
	\| cal 1055B (Microstella + COSC, 7.1mm)		\| cal 1055B (Microstella + COSC, 7.1mm)
	\| ~~First~~ Day-Date ~~on the President~~ bracelet. ~~First Rolex reference of any line with "Superlative Chronometer Officially Certified"~~ dial ~~designation~~.		\| Strong early President-bracelet association; the first Day-Date records show varied bracelet fitments. The 6611 carries the SCOC dial wording.
	\|-		\|-
	\| '''6612'''		\| '''6612'''
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	== Sources ==		== Sources ==

			* [https://www.rolex.com/about-rolex/history/1953-1967 Rolex, history 1953–1967: Day-Date and President bracelet launch]
			* [https://www.phillips.com/detail/rolex/CH080115/41 Phillips, 2015, lot 41: 6511 with President bracelet and clasp stamped 2.57]

	* ''The Vintage Rolex Field Manual'', Colin A. White, Morning Tundra		* ''The Vintage Rolex Field Manual'', Colin A. White, Morning Tundra

Admin: Deep correctness and anti-slop audit: Reference 6510

2026-09-22T04:49:57Z

Deep correctness and anti-slop audit: Reference 6510

Show changes

Admin: Batch 30 anti-slop prose audit and heading cleanup

2026-09-22T04:31:11Z

Batch 30 anti-slop prose audit and heading cleanup

Show changes

Admin: Add two direct 6510 auction lots (Antiquorum 2000 pink gold, Antiquorum 2015 movement); fix 6511 lot currency CHF not USD (verified against Phillips lot page); register missing auction-lot sources

2026-09-14T04:47:16Z

Add two direct 6510 auction lots (Antiquorum 2000 pink gold, Antiquorum 2015 movement); fix 6511 lot currency CHF not USD (verified against Phillips lot page); register missing auction-lot sources

← Older revision		Revision as of 04:47, 14 September 2026
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	===Phillips Glamorous Day-Date, Geneva, 8 May 2015 (separate lot)===		===Phillips Glamorous Day-Date, Geneva, 8 May 2015 (separate lot)===

	6511 in 18k yellow gold, c.1955, complete with guarantee, wallet, and box. Estimate ~~USD~~ 20,000-40,000; hammer ~~above USD 205~~,000. The most-cited 6511 lot result in the cluster market, and it informs the 6510 by adjacent reference.		6511 in 18k yellow gold, c.1955, complete with guarantee, wallet, and box, case No. 111,654. Estimate CHF 20,000-40,000; hammer CHF 191,000. The most-cited 6511 lot result in the cluster market, and it informs the 6510 by adjacent reference.

	===Antiquorum Geneva, Exceptional Horological Works of Art, 19 October 2002, Lot 37===		===Antiquorum Geneva, Exceptional Horological Works of Art, 19 October 2002, Lot 37===
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	Direct 6510 auction lots are uncommon in the major-house catalogue track because surfaced examples are rare and many transactions sit in private retail. The 6510's market value in the modern collector cycle (2025-2026) rests on cluster comparables; direct lot history is scarce. Verified period production runs in low numbers; Goldberger omitted the originals-era cluster from later editions of his ''100 Superlative Rolex Watches'' because clean examples were too rare to source, and the cluster as a whole is a connoisseur-tier category with thin trading volume.		Direct 6510 auction lots are uncommon in the major-house catalogue track because surfaced examples are rare and many transactions sit in private retail. The 6510's market value in the modern collector cycle (2025-2026) rests on cluster comparables; direct lot history is scarce. Verified period production runs in low numbers; Goldberger omitted the originals-era cluster from later editions of his ''100 Superlative Rolex Watches'' because clean examples were too rare to source, and the cluster as a whole is a connoisseur-tier category with thin trading volume.

			Two direct 6510 lots have surfaced at Antiquorum. "100 Years of Wristwatches," Geneva, 19 November 2000, Lot 258, sold a complete 18k pink-gold 6510: tonneau-shaped three-body case, matte silver dial with applied pink-gold indexes, radium-coated baton hands, cal. 1055. Estimate CHF 8,000-10,000; hammer CHF 12,075. It is the clearest documented example of the pink-gold case option described above. A second lot, New York, 30 September 2015, Lot 153, sold a bare cal. 1055 movement with dial and hands, catalogued jointly as "Ref. 6510/6511" because the movement alone cannot fix which case it came from; sold USD 2,500 against a USD 2,000-3,000 estimate. That joint cataloguing is itself a small data point on how closely the two references share their internals.

	==Originals-era cluster — complete sub-reference roster==		==Originals-era cluster — complete sub-reference roster==
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	* [https://www.rolexforums.com/showthread.php?t=11327271 Rolex Forums community, "Rolex Forums — 1803 Owners and Enablers Thread", Rolex Forums]		* [https://www.rolexforums.com/showthread.php?t=11327271 Rolex Forums community, "Rolex Forums — 1803 Owners and Enablers Thread", Rolex Forums]
	* [https://www.tapatalk.com/groups/vintagerolexforum/ Vintage Rolex Forum community, "Vintage Rolex Forum — 1803 Threads (Tapatalk index)", Vintage Rolex Forum (Tapatalk)]		* [https://www.tapatalk.com/groups/vintagerolexforum/ Vintage Rolex Forum community, "Vintage Rolex Forum — 1803 Threads (Tapatalk index)", Vintage Rolex Forum (Tapatalk)]
			* [https://www.phillips.com/detail/rolex/CH080115/43 Phillips, "Rolex Ref. 6612, platinum and diamonds", Glamorous Day-Date, Geneva, 2015-05-08, Lot 43]
			* [https://www.phillips.com/detail/rolex/CH080115/40 Phillips, "Rolex Ref. 6511, yellow gold", Glamorous Day-Date, Geneva, 2015-05-08, Lot 40]
			* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-31-37 Antiquorum, "Rolex Ref. 6611 steel, École d'Horlogerie de Genève", Geneva, 2002-10-19, Lot 37]
			* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-66-258 Antiquorum, "Rolex Ref. 6510, pink gold", 100 Years of Wristwatches, Geneva, 2000-11-19, Lot 258]
			* [https://catalog.antiquorum.swiss/en/lots/rolex-ref-6510-6511-lot-293-153 Antiquorum, "Rolex Ref. 6510/6511 movement lot", New York, 2015-09-30, Lot 153]

	[[Category:Day-Date]]		[[Category:Day-Date]]
	[[Category:References]]		[[Category:References]]

Klaudiusz: Image fix: replace wrong fluted-bezel/President-bracelet hero (likely mislabeled 6611) with a verified 6510 (smooth/domed bezel, Jubilee bracelet, Phillips HK Lot 293); update lead caption/alt and SEO image_alt to match.

2026-09-13T17:55:06Z

Image fix: replace wrong fluted-bezel/President-bracelet hero (likely mislabeled 6611) with a verified 6510 (smooth/domed bezel, Jubilee bracelet, Phillips HK Lot 293); update lead caption/alt and SEO image_alt to match.

← Older revision		Revision as of 17:55, 13 September 2026
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	\|keywords=Rolex 6510, Day-Date, Huguenin patent, cal 1055, cal 1055B, Jubilee bracelet, Basel 1956, originals era, 6611, 6612, 6613, 6611B, 6612B, Microstella, SCOC		\|keywords=Rolex 6510, Day-Date, Huguenin patent, cal 1055, cal 1055B, Jubilee bracelet, Basel 1956, originals era, 6611, 6612, 6613, 6611B, 6612B, Microstella, SCOC
	\|image=Ref 6510 hero.webp		\|image=Ref 6510 hero.webp
	\|image_alt=Rolex Day-Date 6510 ~~/ 6511~~ — ~~the 1956 originals-era pair. The 6510 carries the~~ smooth/domed bezel~~; the 6511 carries the fluted bezel that becomes the Day~~-~~Date signature~~.		\|image_alt=Rolex Day-Date 6510, 1956, 18k yellow gold — smooth/domed bezel and Jubilee-era textured bracelet. Phillips, Hong Kong Watch Auction: TWO, Lot 293.
	\|type=Article		\|type=Article
	\|og_type=article		\|og_type=article
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	<div class="rp-lead">		<div class="rp-lead">
	[[File:Ref 6510 hero.webp\|thumb\|center\|640px\|alt=Rolex Day-Date 6510 ~~/ 6511~~ — ~~the 1956 originals-era pair. The 6510 carries the~~ smooth/domed bezel~~; the 6511 carries the fluted bezel that becomes the Day~~-~~Date signature~~.\|Rolex Day-Date 6510 ~~/ 6511~~ — ~~the 1956 originals-era pair. The 6510 carries the~~ smooth/domed bezel~~; the 6511 carries the fluted bezel that becomes the Day~~-~~Date signature~~.]]		[[File:Ref 6510 hero.webp\|thumb\|center\|640px\|alt=Rolex Day-Date 6510, 1956, 18k yellow gold — smooth/domed bezel and Jubilee-era textured bracelet. Phillips, Hong Kong Watch Auction: TWO, Lot 293.\|Rolex Day-Date 6510, 1956, 18k yellow gold — smooth/domed bezel and Jubilee-era textured bracelet. Case No. 214'033. Phillips, Hong Kong Watch Auction: TWO, Lot 293.]]
	</div>		</div>

Admin: Prose review: remove research commentary, inflated claims and repetitive phrasing

2026-09-12T04:27:54Z

Prose review: remove research commentary, inflated claims and repetitive phrasing

← Older revision		Revision as of 04:27, 12 September 2026
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	</div>		</div>

	The 6510 is the original Day-Date, the first wristwatch with the day of the week spelled out in full at twelve o'clock combined with the date at three. Marc Huguenin filed two related Swiss patents in 1955 covering the mechanism, with a ~~1950~~ priority filing ~~as the architectural ancestor~~, and Rolex debuted the watch at the Basel Fair in 1956. The reference launches on the Jubilee bracelet. The President bracelet, the fitment that gives the line its modern nickname, arrives a year later in 1957 with the 6611. The "Presidential" nickname itself does not enter Rolex advertising until 1965-1966, when President Lyndon B. Johnson is photographed wearing a yellow-gold 1803 and Rolex builds the campaign around the image. Period 6510 retail marketing called the watch the "Day-Date" or the "Oyster Perpetual Day-Date"; Rolex had not yet coined the President name for it~~. The 6510 sits chronologically before the political-watch-gift culture the Day-Date later anchors. It was a connoisseur's watch first~~.		The 6510 is the original Day-Date, the first wristwatch with the day of the week spelled out in full at twelve o'clock combined with the date at three. Marc Huguenin filed two related Swiss patents in 1955 covering the mechanism, with a related priority filing from 1950, and Rolex debuted the watch at the Basel Fair in 1956. The reference launches on the Jubilee bracelet. The President bracelet, the fitment that gives the line its modern nickname, arrives a year later in 1957 with the 6611. The "Presidential" nickname itself does not enter Rolex advertising until 1965-1966, when President Lyndon B. Johnson is photographed wearing a yellow-gold 1803 and Rolex builds the campaign around the image. Period 6510 retail marketing called the watch the "Day-Date" or the "Oyster Perpetual Day-Date"; Rolex had not yet coined the President name for it.

	==Core facts==		==Core facts==
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	A 1950 Swiss patent filing credited to Marc Huguenin (Rolex's day-date complication engineer) covers the architectural ancestor of the mechanism. Two cataloged 1955 filings, both with Huguenin as inventor, split the engineering. CH 322341A is the instant-change date, a cam-and-jumper architecture that snaps the date wheel through midnight in a single impulse; a small auxiliary spring, tensioned through the day and discharged at the trigger, keeps the seconds train from losing timekeeping energy. CH 323982A is the Day-Date module proper, a seven-toothed star wheel above a 31-tooth calendar wheel, advanced via concentric levers from the main calendar pinion.		A 1950 Swiss patent filing credited to Marc Huguenin (Rolex's day-date complication engineer) covers the architectural ancestor of the mechanism. Two cataloged 1955 filings, both with Huguenin as inventor, split the engineering. CH 322341A is the instant-change date, a cam-and-jumper architecture that snaps the date wheel through midnight in a single impulse; a small auxiliary spring, tensioned through the day and discharged at the trigger, keeps the seconds train from losing timekeeping energy. CH 323982A is the Day-Date module proper, a seven-toothed star wheel above a 31-tooth calendar wheel, advanced via concentric levers from the main calendar pinion.

	The CH 322341A mechanism is the architectural ancestor of every Rolex date complication from 1955 forward and survives functionally into the cal 3255 of the modern Day-Date 40 / Day-Date 36. The CH 323982A module powers the Day-Date specifically. Both architectures are unique to Rolex through the production period and no record of Rolex litigating either patent has surfaced. Later day-date competitors (Mido, Enicar, Seiko 1959) use independently engineered modules. ~~The Huguenin patents appear to have served a purely defensive function~~.		The CH 322341A mechanism is the architectural ancestor of every Rolex date complication from 1955 forward and survives functionally into the cal 3255 of the modern Day-Date 40 / Day-Date 36. The CH 323982A module powers the Day-Date specifically. Both architectures are unique to Rolex through the production period and no record of Rolex litigating either patent has surfaced. Later day-date competitors (Mido, Enicar, Seiko 1959) use independently engineered modules. Their commercial role beyond protecting the mechanisms is undocumented.

	===Basel Fair launch (1956)===		===Basel Fair launch (1956)===
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	===Phillips Glamorous Day-Date, Geneva, 8 May 2015, Lot 43===		===Phillips Glamorous Day-Date, Geneva, 8 May 2015, Lot 43===

	Platinum diamond-set 6612, c.1958. One of two known platinum 6612s with consecutive case numbers; the sibling is documented in John Goldberger's ''100 Superlative Rolex Watches'' (Damiani Editore, 2008, ISBN 9788862080194). Dial carries 8 round-cut and 2 baguette-cut diamond hour markers, with the baguettes at six and nine o'clock. Estimate CHF 100,000-200,000; hammer CHF 473,000. ~~The headline~~ result for the ~~originals~~-~~era cluster and the lot that re-anchored the cluster market in the modern auction cycle~~.		Platinum diamond-set 6612, c.1958. One of two known platinum 6612s with consecutive case numbers; the sibling is documented in John Goldberger's ''100 Superlative Rolex Watches'' (Damiani Editore, 2008, ISBN 9788862080194). Dial carries 8 round-cut and 2 baguette-cut diamond hour markers, with the baguettes at six and nine o'clock. Estimate CHF 100,000-200,000; hammer CHF 473,000. It was a major result for the early Day-Date references.

	===Phillips Glamorous Day-Date, Geneva, 8 May 2015 (separate lot)===		===Phillips Glamorous Day-Date, Geneva, 8 May 2015 (separate lot)===
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	* Pope Paul VI. Famously associated with a yellow-gold Day-Date during his pontificate (1963-1978). Reference attribution most commonly points to the 1803, a later piece than the originals-era cluster.		* Pope Paul VI. Famously associated with a yellow-gold Day-Date during his pontificate (1963-1978). Reference attribution most commonly points to the 1803, a later piece than the originals-era cluster.

	The ~~originals~~-era cluster sits before the political watch-gift tradition the Day-Date later anchors. The 6510 / 6611 are connoisseur watches from the 1956-1959 window, predating the line's status-totem reputation. The Presidential gift culture is built on the 1803 in the 1960s and 1970s.		The better-documented presidential associations belong to the 1803 in the 1960s and 1970s.

Klaudiusz: Text audit: voice, clarity — cut negation pivots, research-scaffold leakage (out-of-scope parens, open-question tag), colon-elaboration in patent paragraph

2026-09-07T13:01:10Z

Text audit: voice, clarity — cut negation pivots, research-scaffold leakage (out-of-scope parens, open-question tag), colon-elaboration in patent paragraph

Show changes

Admin: Layout: restore the original lead caption

2026-09-06T23:00:52Z

Layout: restore the original lead caption

← Older revision		Revision as of 23:00, 6 September 2026
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	<div class="rp-lead">		<div class="rp-lead">
	[[File:Ref 6510 hero.webp\|thumb\|center\|640px\|alt=Rolex 6510 Day-Date\|Rolex 6510 Day-Date]]		[[File:Ref 6510 hero.webp\|thumb\|center\|640px\|alt=Rolex Day-Date 6510 / 6511 — the 1956 originals-era pair. The 6510 carries the smooth/domed bezel; the 6511 carries the fluted bezel that becomes the Day-Date signature.\|Rolex Day-Date 6510 / 6511 — the 1956 originals-era pair. The 6510 carries the smooth/domed bezel; the 6511 carries the fluted bezel that becomes the Day-Date signature.]]
	</div>		</div>

← Older revision		Revision as of 07:26, 29 September 2026
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	===Caliber upgrade (1957, cal 1055B)===		===Caliber upgrade (1957, cal 1055B)===

	The 6611 also introduces the upgraded cal 1055B: 7.1mm height (0.1mm taller than the original cal 1055), free-sprung Microstella balance (the four-screw gold-mass adjustment on the balance rim that defines Rolex regulation through to the modern cal 3255), Breguet overcoil hairspring (Antiquorum's October 2002 Lot 37 essay confirms the construction), and COSC chronometer certification ~~(the first Rolex reference of any line to carry it)~~. The 6611's dial introduces the "Superlative Chronometer Officially Certified" four-line text block at six o'clock, the first ~~SCOC dial designation~~ across Rolex. Earlier 6510 / 6511 examples retain the pre-COSC "Superlative Chronometer by Official Test" or "Officially Certified Chronometer" lines.		The 6611 also introduces the upgraded cal 1055B: 7.1mm height (0.1mm taller than the original cal 1055), free-sprung Microstella balance (the four-screw gold-mass adjustment on the balance rim that defines Rolex regulation through to the modern cal 3255), Breguet overcoil hairspring (Antiquorum's October 2002 Lot 37 essay confirms the construction), and COSC chronometer certification. The 6611's dial introduces the "Superlative Chronometer Officially Certified" four-line text block at six o'clock. The cited Day-Date records place the SCOC line with the 6611; they do not establish a first across every Rolex line. Earlier 6510 / 6511 examples retain the pre-COSC "Superlative Chronometer by Official Test" or "Officially Certified Chronometer" lines.

	A small number of transitional 6510 examples surface with the upgraded cal 1055B and the SCOC dial line. Phillips and Antiquorum essay tradition treats these as transitional builds where the reference case was already stamped 6510 but the movement and dial received the upgraded specification. ~~Fewer than five are documented in the~~ published auction record.		A small number of transitional 6510 examples surface with the upgraded cal 1055B and the SCOC dial line. Phillips and Antiquorum essay tradition treats these as transitional builds where the reference case was already stamped 6510 but the movement and dial received the upgraded specification. The published auction record documents only a small number of these transitional examples.

	===Originals-era closeout (1958-1959)===		===Originals-era closeout (1958-1959)===
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	===Phillips Glamorous Day-Date, Geneva, 8 May 2015, Lot 43===		===Phillips Glamorous Day-Date, Geneva, 8 May 2015, Lot 43===

	Platinum diamond-set 6612, c.1958. One of two known platinum 6612s with consecutive case numbers; the sibling is documented in John Goldberger's ''100 Superlative Rolex Watches'' (Damiani Editore, 2008, ISBN 9788862080194). Dial carries 8 round-cut and 2 baguette-cut diamond hour markers, with the baguettes at six and nine o'clock. Estimate CHF 100,000-200,000; hammer CHF 473,000. ~~It was~~ a ~~major result~~ for the early Day-Date references.		Platinum diamond-set 6612, c.1958. One of two known platinum 6612s with consecutive case numbers; the sibling is documented in John Goldberger's ''100 Superlative Rolex Watches'' (Damiani Editore, 2008, ISBN 9788862080194). Dial carries 8 round-cut and 2 baguette-cut diamond hour markers, with the baguettes at six and nine o'clock. Estimate CHF 100,000-200,000; hammer CHF 473,000. The result is recorded here as a lot-level comparison for the early Day-Date references.

	===Phillips Glamorous Day-Date, Geneva, 8 May 2015 (separate lot)===		===Phillips Glamorous Day-Date, Geneva, 8 May 2015 (separate lot)===

	6511 in 18k yellow gold, c.1955, complete with guarantee, wallet, and box, case No. 111,654. Estimate CHF 20,000-40,000; hammer CHF 191,000. ~~The most~~-~~cited 6511 lot~~ result ~~in the cluster market, and it informs~~ the 6510 ~~by adjacent reference~~.		6511 in 18k yellow gold, c.1955, complete with guarantee, wallet, and box, case No. 111,654. Estimate CHF 20,000-40,000; hammer CHF 191,000. This adjacent-reference result is included for comparison with the 6510.

	===Antiquorum Geneva, Exceptional Horological Works of Art, 19 October 2002, Lot 37===		===Antiquorum Geneva, Exceptional Horological Works of Art, 19 October 2002, Lot 37===
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	6611 stainless steel, École d'Horlogerie de Genève prize watch. Caseback engraved "Ecole d'Horlogerie de Genève – 1963" with the Rolex crown logo. The lot is one of only six stainless-steel Day-Dates Rolex ever produced, a marketing-test run donated as prize watches to top École d'Horlogerie graduates, with the school distribution completed by 1963 (hence the engraving year). The lot card lists "circa 1959" for case production with the 1963 engraving for the school dedication; caliber listed as "1556, 26 jewels, Breguet balance spring" (a known Antiquorum cataloguing imprecision, since the underlying movement is the cal 1055B with Breguet overcoil and free-sprung Microstella). 36mm tonneau case fitted to a stainless-steel Oyster bracelet. Estimate CHF 25,000-30,000; hammer CHF 50,600. ~~Only~~ one of the ~~six École d'Horlogerie steel 6611s has surfaced publicly. The~~ other five ~~sit~~ in ~~private collections or family-inheritance chains; the school's graduate records would identify~~ the ~~six recipients but are not~~ public.		6611 stainless steel, École d'Horlogerie de Genève prize watch. Caseback engraved "Ecole d'Horlogerie de Genève – 1963" with the Rolex crown logo. The lot is one of only six stainless-steel Day-Dates Rolex ever produced, a marketing-test run donated as prize watches to top École d'Horlogerie graduates, with the school distribution completed by 1963 (hence the engraving year). The lot card lists "circa 1959" for case production with the 1963 engraving for the school dedication; caliber listed as "1556, 26 jewels, Breguet balance spring" (a known Antiquorum cataloguing imprecision, since the underlying movement is the cal 1055B with Breguet overcoil and free-sprung Microstella). 36mm tonneau case fitted to a stainless-steel Oyster bracelet. Estimate CHF 25,000-30,000; hammer CHF 50,600. The cited lot is one documented example; the other five are not identified in the cited public record.

	===Auction context for 6510 specifically===		===Auction context for 6510 specifically===

	~~Direct~~ 6510 ~~auction lots are uncommon in the major-house catalogue track because surfaced examples are rare~~ and ~~many transactions sit in private retail. The 6510's market value in the modern collector cycle (2025~~-~~2026) rests on cluster~~ comparables~~; direct lot history is scarce~~. ~~Verified period~~ production ~~runs in low numbers; Goldberger omitted the originals-era cluster from later editions of his ''100 Superlative Rolex Watches'' because clean examples were too rare to source~~, ~~and~~ the ~~cluster as a whole is a connoisseur-tier category with thin trading volume~~.		The sources here contain two direct 6510 entries and several adjacent-reference comparables. They do not provide a complete auction census, production total, or reliable market history for the reference.

	Two direct 6510 lots have surfaced at Antiquorum. "100 Years of Wristwatches," Geneva, 19 November 2000, Lot 258, sold a complete 18k pink-gold 6510: tonneau-shaped three-body case, matte silver dial with applied pink-gold indexes, radium-coated baton hands, cal. 1055. Estimate CHF 8,000-10,000; hammer CHF 12,075. It is the clearest documented example of the pink-gold case option described above. A second lot, New York, 30 September 2015, Lot 153, sold a bare cal. 1055 movement with dial and hands, catalogued jointly as "Ref. 6510/6511" because the movement alone cannot fix which case it came from; sold USD 2,500 against a USD 2,000-3,000 estimate. That joint cataloguing is itself a small data point on how closely the two references share their internals.		Two direct 6510 lots have surfaced at Antiquorum. "100 Years of Wristwatches," Geneva, 19 November 2000, Lot 258, sold a complete 18k pink-gold 6510: tonneau-shaped three-body case, matte silver dial with applied pink-gold indexes, radium-coated baton hands, cal. 1055. Estimate CHF 8,000-10,000; hammer CHF 12,075. It is the clearest documented example of the pink-gold case option described above. A second lot, New York, 30 September 2015, Lot 153, sold a bare cal. 1055 movement with dial and hands, catalogued jointly as "Ref. 6510/6511" because the movement alone cannot fix which case it came from; sold USD 2,500 against a USD 2,000-3,000 estimate. That joint cataloguing is itself a small data point on how closely the two references share their internals.