Reference:pre-daytona-chronographs - Revision history

Admin: site-wide: domain move BezelBase → Rolexopedia (rolexopedia.net)

2026-09-05T00:38:57Z

site-wide: domain move BezelBase → Rolexopedia (rolexopedia.net)

← Older revision		Revision as of 00:38, 5 September 2026
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	{{DISPLAYTITLE:Rolex pre-Daytona chronographs}}		{{DISPLAYTITLE:Rolex pre-Daytona chronographs}}
	{{#seo:		{{#seo:
	\|title=Rolex Pre-Daytona Chronographs — 1937–1963 Guide \| ~~BezelBase~~		\|title=Rolex Pre-Daytona Chronographs — 1937–1963 Guide \| Rolexopedia
	\|description=The Rolex chronograph line before the 1963 Cosmograph Daytona launch. Antimagnetique 2508, Monoblocco 3525 and the WWII POW watches, the 4xxx tonneau Oysters, the 6034 anti-magnetic, and the 6234 / 6238 Pre-Daytona references that hand off to the 6239.		\|description=The Rolex chronograph line before the 1963 Cosmograph Daytona launch. Antimagnetique 2508, Monoblocco 3525 and the WWII POW watches, the 4xxx tonneau Oysters, the 6034 anti-magnetic, and the 6234 / 6238 Pre-Daytona references that hand off to the 6239.
	\|keywords=Rolex chronograph, Pre-Daytona, Antimagnetique, Monoblocco, Barilotto, 2508, 3525, 3668, 3833, 4099, 4500, 4537, 4767, 5034, 6034, 6234, 6238, Valjoux 23, Valjoux 72, vintage Rolex		\|keywords=Rolex chronograph, Pre-Daytona, Antimagnetique, Monoblocco, Barilotto, 2508, 3525, 3668, 3833, 4099, 4500, 4537, 4767, 5034, 6034, 6234, 6238, Valjoux 23, Valjoux 72, vintage Rolex

Admin: Fact fix: citation mislabeled ref 3666 (a distinct, already-documented pre-Submariner reference) when the described watch is 3668, the 3525's reeded-bezel chronograph sibling per this article's own table

2026-08-11T18:44:36Z

Fact fix: citation mislabeled ref 3666 (a distinct, already-documented pre-Submariner reference) when the described watch is 3668, the 3525's reeded-bezel chronograph sibling per this article's own table

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	* [https://catalog.antiquorum.swiss/ Antiquorum — 3525 Brownlee POW lot] (2023). USAAF 1st Lt Leon W. Brownlee, Stalag 7A Moosburg.		* [https://catalog.antiquorum.swiss/ Antiquorum — 3525 Brownlee POW lot] (2023). USAAF 1st Lt Leon W. Brownlee, Stalag 7A Moosburg.
	* [https://www.phillips.com/auctions/watches Phillips — 3525 Dickins POW lot]. RAF Wing Commander Douglas S. Dickins.		* [https://www.phillips.com/auctions/watches Phillips — 3525 Dickins POW lot]. RAF Wing Commander Douglas S. Dickins.
	* [https://www.phillips.com/auctions/watches Phillips — ~~3666~~ Valjoux chronograph lot]. Sister reference to the 3525 with reeded gold bezel.		* [https://www.phillips.com/auctions/watches Phillips — 3668 Valjoux chronograph lot]. Sister reference to the 3525 with reeded gold bezel.
	* [https://alpha-hands.com/ Alpha Hands — 3525 case-number research]. Project recording case-number bands across the 1939–1945 production window.		* [https://alpha-hands.com/ Alpha Hands — 3525 case-number research]. Project recording case-number bands across the 1939–1945 production window.
	* [https://www.windvintage.com/ Wind Vintage — 3525 POW research].		* [https://www.windvintage.com/ Wind Vintage — 3525 POW research].

Admin: Text audit: voice, clarity, source links

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Text audit: voice, clarity, source links

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	The Cal. 72B → Cal. 722 transition runs through the [[Reference:6238\|6238]] itself. First-series 6238 production carried the unstamped Cal. 72B held over from the late 6234; the second-series redesign brought the Rolex-stamped Cal. 722 that then powered the 6239 and 6241. Russell Sheldrake documents the transition in ''Is the Rolex Pre-Daytona a Forgotten Classic?'' for A Collected Man (2020).		The Cal. 72B to Cal. 722 transition runs through the [[Reference:6238\|6238]] itself. First-series 6238 production carried the unstamped Cal. 72B held over from the late 6234; the second-series redesign brought the Rolex-stamped Cal. 722 that then powered the 6239 and 6241. Russell Sheldrake documents the transition in ''Is the Rolex Pre-Daytona a Forgotten Classic?'' for A Collected Man (2020).

	The frequency stays at 18,000 vph (2.5 Hz), 17 jewels, no hack and no quickset, all the way through to Cal. 727 in 1970, two references beyond the end of this line.		The frequency stays at 18,000 vph (2.5 Hz), 17 jewels, no hack and no quickset, all the way through to Cal. 727 in 1970, two references beyond the end of this line.

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Text audit: voice, clarity, source links

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	~~== Rolex pre-Daytona chronographs ==~~		The Cosmograph Daytona name arrives in 1963 with the [[Reference:6239\|6239]]. Rolex had been building chronographs for thirty years by then. The line that runs into the Daytona starts with the late-1930s Antimagnetique chronographs, moves through the Oyster chronograph references of the 1940s and 1950s, and ends with the [[Reference:6238\|6238]] Pre-Daytona, which hands the layout to the 6239 with two cosmetic changes.

	The Cosmograph Daytona name arrives in 1963 with the [[Reference:6239\|6239]]. Rolex had been building chronographs for thirty years by then. ~~This page covers the~~ line that runs into the Daytona ~~— from~~ the late-1930s Antimagnetique chronographs through the Oyster chronograph references of the 1940s and 1950s, ~~ending~~ with the [[Reference:6238\|6238]] Pre-Daytona ~~that~~ hands the layout to the 6239 with two cosmetic changes.

	The thread that ties the line together is the chronograph movement, not the case. Every reference here runs a Valjoux base — Cal. 23 VZ in the Antimagnetique era, Cal. 72 in the late references — finished by Rolex and catalogued under a Rolex caliber number. The case work is what changed: from non-Oyster snap-back cases in the late 1930s, to the one-piece ''Monoblocco'' Oyster of the 3525, to the tonneau Oyster of the 4xxx series, to the screw-down-pusher 6034, and finally to the round 36mm Oyster that defined the Daytona.		The thread that ties the line together is the chronograph movement, not the case. Every reference here runs a Valjoux base — Cal. 23 VZ in the Antimagnetique era, Cal. 72 in the late references — finished by Rolex and catalogued under a Rolex caliber number. The case work is what changed: from non-Oyster snap-back cases in the late 1930s, to the one-piece ''Monoblocco'' Oyster of the 3525, to the tonneau Oyster of the 4xxx series, to the screw-down-pusher 6034, and finally to the round 36mm Oyster that defined the Daytona.
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	== Antimagnetique era (late 1930s to mid-1940s) ==		== Antimagnetique era (late 1930s to mid-1940s) ==

	The earliest Rolex chronographs sit in non-Oyster cases with snap-back construction. They carry the ''Antimagnetique'' designation on the dial~~, signalling~~ a soft-iron inner case that shielded the movement from magnetic fields — the same protection later watches would carry under the Milgauss line. ~~Two-register~~ layout, Valjoux 23 VZ base, tachometer and telemeter scales, blued steel hands. ~~This is also the~~ era ~~that~~ produced the WWII POW-watch trade: Rolex shipped chronographs on credit to British and Allied officers held in German prisoner-of-war camps under Hans Wilsdorf's pay-after-the-war policy.		The earliest Rolex chronographs sit in non-Oyster cases with snap-back construction. They carry the ''Antimagnetique'' designation on the dial for a soft-iron inner case that shielded the movement from magnetic fields, the same protection later watches would carry under the Milgauss line. The layout runs two registers on a Valjoux 23 VZ base, with tachometer and telemeter scales and blued steel hands. The same era produced the WWII POW-watch trade: Rolex shipped chronographs on credit to British and Allied officers held in German prisoner-of-war camps under Hans Wilsdorf's pay-after-the-war policy.

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	== Pre-Cosmograph round Oyster chronographs (1950–1968) ==		== Pre-Cosmograph round Oyster chronographs (1950–1968) ==

	The case work returns to a round Oyster in the early 1950s, and the chronograph base shifts from Valjoux 23 to Valjoux 72. ~~The 6034 is~~ the technical ~~pivot —~~ first round-Oyster Rolex chronograph, screw-down pushers, anti-magnetic inner case ~~— and~~ the 6234 ~~then~~ runs that configuration through the bulk of the 1950s in steel volume. The 6238 is the immediate predecessor of the Cosmograph: same 36mm Oyster case, same Valjoux 72 base, same dial-printed tachymetre. The 6239 in 1963 took the layout, moved the tachymetre to the bezel, and added the Cosmograph signature.		The case work returns to a round Oyster in the early 1950s, and the chronograph base shifts from Valjoux 23 to Valjoux 72. Most of the technical change lands on the 6034: first round-Oyster Rolex chronograph, screw-down pushers, anti-magnetic inner case. From there the 6234 runs that configuration through the bulk of the 1950s in steel volume. The 6238 is the immediate predecessor of the Cosmograph, with the same 36mm Oyster case, the same Valjoux 72 base, and the same dial-printed tachymetre. The 6239 in 1963 took the layout, moved the tachymetre to the bezel, and added the Cosmograph signature.

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	== Triple-calendar parallels ~~(not in the chronograph-only lineage)~~ ==		== Triple-calendar parallels ==

	Two related references ~~are sometimes~~ grouped with the pre-Daytona chronographs but sit on a different mechanical platform~~. Both are triple-calendar watches~~, and ~~the 6236 carries a chronograph alongside the calendar work, but~~ neither ~~sits~~ in the direct line that hands off to the Cosmograph Daytona.		Two related references get grouped with the pre-Daytona chronographs but sit on a different mechanical platform, and neither belongs in the direct line that hands off to the Cosmograph Daytona.

	The 6036 and 6236 carry the ''Jean-Claude Killy'' nickname, after the French Olympic skier who owned a 6236, and run the Valjoux 72C — the calendar variant of the Valjoux 72. The 6036 came first (c.1951–1957), then the 6236 (1958–1962). ~~They~~ are chronograph triple-calendar watches, technically demanding, and rare. Pucci Papaleo's ''I Cronografi Rolex – La Leggenda'' treats them as their own family rather than a step in the Daytona lineage.		The 6036 and 6236 carry the ''Jean-Claude Killy'' nickname, after the French Olympic skier who owned a 6236, and run the Valjoux 72C, the calendar variant of the Valjoux 72. The 6036 came first (c.1951–1957), then the 6236 (1958–1962). Both are chronograph triple-calendar watches, technically demanding and rare. Pucci Papaleo's ''I Cronografi Rolex – La Leggenda'' treats them as their own family rather than a step in the Daytona lineage.

	The 8171 ''Padellone'' is a triple-calendar moonphase ~~but is not~~ a chronograph~~. It~~ belongs in the pre-Daytona historical context only as a sibling complication.		The [[Reference:8171\|8171]] ''Padellone'' is a triple-calendar moonphase without a chronograph, and belongs in the pre-Daytona historical context only as a sibling complication.

	== Movement and case lineage ==		== Movement and case lineage ==
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	The Cal. 72B → Cal. 722 transition runs through the [[Reference:6238\|6238]] itself. First-series 6238 production carried the unstamped Cal. 72B held over from the late 6234; the second-series redesign brought the Rolex-stamped Cal. 722 that then powered the 6239 and 6241. Russell Sheldrake documents the transition in ~~his~~ ''Is the Rolex Pre-Daytona a Forgotten Classic?'' for A Collected Man.		The Cal. 72B → Cal. 722 transition runs through the [[Reference:6238\|6238]] itself. First-series 6238 production carried the unstamped Cal. 72B held over from the late 6234; the second-series redesign brought the Rolex-stamped Cal. 722 that then powered the 6239 and 6241. Russell Sheldrake documents the transition in ''Is the Rolex Pre-Daytona a Forgotten Classic?'' for A Collected Man (2020).

	The frequency stays at 18,000 vph (2.5 Hz), 17 jewels, no hack and no quickset, all the way through to Cal. 727 in 1970 — two references ~~downstream~~ of ~~where~~ this ~~page ends~~.		The frequency stays at 18,000 vph (2.5 Hz), 17 jewels, no hack and no quickset, all the way through to Cal. 727 in 1970, two references beyond the end of this line.

	== Why the line matters ==		== Why the line matters ==

	Every technical move that defines the Daytona was solved on a pre-Daytona reference. ~~The~~ 3525 ~~made the chronograph waterproof~~. The 4xxx-generation ~~references~~ softened the case shape~~. The 6034 brought~~ screw-down pushers. ~~The~~ 6234 carried the line ~~through the 1950s~~ in steel volume. ~~The~~ 6238 fixed ~~the~~ 36mm round Oyster, ~~the~~ pump pushers, ~~the~~ dial-printed tachymetre, ~~and the~~ Valjoux 72 ~~movement that~~ the 6239 ~~then~~ inherited. Aurel Bacs, in Russell Sheldrake's A Collected Man interview, described the 6238 as "almost a sibling of the Daytona, not a Pre-Daytona": the production windows of the 6238 and 6239 overlap by roughly four years, and the gap between them is two cosmetic changes rather than a clean break.		Every technical move that defines the Daytona was solved on a pre-Daytona reference. Waterproofing came with the 3525. The 4xxx generation softened the case shape, and screw-down pushers arrived on the 6034. Through the 1950s the 6234 carried the line in steel volume. By the 6238 the package was fixed — 36mm round Oyster, pump pushers, dial-printed tachymetre, Valjoux 72 — and the 6239 inherited all of it. Aurel Bacs, in Russell Sheldrake's A Collected Man interview, described the 6238 as "almost a sibling of the Daytona, not a Pre-Daytona": the production windows of the 6238 and 6239 overlap by roughly four years, and the gap between them is two cosmetic changes rather than a clean break.

	The market sorts the line accordingly. The 3525 trades on its WWII history and the Monoblocco case, with POW-provenance examples reaching the £60,000–100,000 band at Antiquorum and Sotheby's. The 4xxx tonneau references trade on rarity and case design rather than provenance; documented examples surface only occasionally at major-house sales. The 6034 trades on its position as the first round-Oyster Rolex chronograph. The 6234 and 6238 trade on Daytona-adjacency, with clean steel examples consistently above the rest of the pre-Cosmograph line.

	~~== Related family pages ==~~

	* [[Reference:daytona\|Daytona]] — the Cosmograph line that begins where this page ends, from the 1963 [[Reference:6239\|6239]] through the in-house cal 4130 generation.
	* [[Reference:Movements\|Movements]] — the Valjoux 23 family, the Valjoux 72 progression (Cal. 72B / 722 / 727), and the eventual move to Zenith and in-house calibers.
	* [[Reference:Bracelets\|Bracelets]] — the early rivet bracelets (6635, 7205) and end links fitted to the chronograph case across the line.

			The market sorts the line accordingly. WWII history and the Monoblocco case carry the 3525, with POW-provenance examples reaching the £60,000–100,000 band at Antiquorum and Sotheby's. The 4xxx tonneau references sell on rarity and case design instead of provenance, and documented examples surface only occasionally at major-house sales. Being the first round-Oyster Rolex chronograph is what the 6034 trades on. The 6234 and 6238 trade on Daytona-adjacency, with clean steel examples consistently above the rest of the pre-Cosmograph line.

	== Related references ==		== Related references ==

	* [[Reference:daytona\|Daytona family index]]		* [[Reference:daytona\|Daytona family index]] — the Cosmograph line that begins where this one ends, from the 1963 [[Reference:6239\|6239]] through the in-house cal 4130 generation
	* [[Reference:3525\|Daytona 3525]] — the WWII 'Monoblocco' chronograph		* [[Reference:3525\|Daytona 3525]] — the WWII 'Monoblocco' chronograph
	* [[Reference:6234\|Daytona 6234]] — pre-Daytona chronograph		* [[Reference:6234\|Daytona 6234]] — pre-Daytona chronograph
	* [[Reference:6238\|Daytona 6238]] — the "pre-Daytona", direct predecessor to the Cosmograph		* [[Reference:6238\|Daytona 6238]] — the "pre-Daytona", direct predecessor to the Cosmograph
	* [[Reference:6239\|Daytona 6239]] — the first watch to carry the Daytona name		* [[Reference:6239\|Daytona 6239]] — the first watch to carry the Daytona name
			* [[Reference:8171\|8171 'Padellone']] — the triple-calendar moonphase sibling
			* [[Reference:Movements\|Movements]] — the Valjoux 23 family, the Valjoux 72 progression (Cal. 72B / 722 / 727), and the move to Zenith and in-house calibers
			* [[Reference:Bracelets\|Bracelets]] — the early rivet bracelets (6635, 7205) and end links fitted to the chronograph case across the line

	== Sources ==		== Sources ==

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	{{DISPLAYTITLE:Rolex pre-Daytona chronographs}}		{{DISPLAYTITLE:Rolex pre-Daytona chronographs}}
	{{#seo:		{{#seo:
	\|title=Rolex Pre-Daytona Chronographs — 1937–1963 Guide \| BezelBase		\|title=Rolex Pre-Daytona Chronographs — 1937–1963 Guide \| BezelBase
	\|description=The Rolex chronograph line before the 1963 Cosmograph Daytona launch. Antimagnetique 2508, Monoblocco 3525 and the WWII POW watches, the 4xxx tonneau Oysters, the 6034 anti-magnetic, and the 6234 / 6238 Pre-Daytona references that hand off to the 6239.		\|description=The Rolex chronograph line before the 1963 Cosmograph Daytona launch. Antimagnetique 2508, Monoblocco 3525 and the WWII POW watches, the 4xxx tonneau Oysters, the 6034 anti-magnetic, and the 6234 / 6238 Pre-Daytona references that hand off to the 6239.
	\|keywords=Rolex chronograph, Pre-Daytona, Antimagnetique, Monoblocco, Barilotto, 2508, 3525, 3668, 3833, 4099, 4500, 4537, 4767, 5034, 6034, 6234, 6238, Valjoux 23, Valjoux 72, vintage Rolex		\|keywords=Rolex chronograph, Pre-Daytona, Antimagnetique, Monoblocco, Barilotto, 2508, 3525, 3668, 3833, 4099, 4500, 4537, 4767, 5034, 6034, 6234, 6238, Valjoux 23, Valjoux 72, vintage Rolex
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	\|og_type=article		\|og_type=article
	\|published_time=2026-04-30T03:24:59Z		\|published_time=2026-04-30T03:24:59Z
	\|modified_time=2026-06-~~29T01~~:23:~~13Z~~		\|modified_time=2026-07-18T14:18:52Z
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Internal linking: related references (thematic hub)

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	* [[Reference:Movements\|Movements]] — the Valjoux 23 family, the Valjoux 72 progression (Cal. 72B / 722 / 727), and the eventual move to Zenith and in-house calibers.		* [[Reference:Movements\|Movements]] — the Valjoux 23 family, the Valjoux 72 progression (Cal. 72B / 722 / 727), and the eventual move to Zenith and in-house calibers.
	* [[Reference:Bracelets\|Bracelets]] — the early rivet bracelets (6635, 7205) and end links fitted to the chronograph case across the line.		* [[Reference:Bracelets\|Bracelets]] — the early rivet bracelets (6635, 7205) and end links fitted to the chronograph case across the line.


			== Related references ==

			* [[Reference:daytona\|Daytona family index]]
			* [[Reference:3525\|Daytona 3525]] — the WWII 'Monoblocco' chronograph
			* [[Reference:6234\|Daytona 6234]] — pre-Daytona chronograph
			* [[Reference:6238\|Daytona 6238]] — the "pre-Daytona", direct predecessor to the Cosmograph
			* [[Reference:6239\|Daytona 6239]] — the first watch to carry the Daytona name

	== Sources ==		== Sources ==

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	\|published_time=2026-04-30T03:24:59Z		\|published_time=2026-04-30T03:24:59Z
	\|modified_time=2026-06-~~04T04~~:42:~~56Z~~		\|modified_time=2026-06-29T01:23:13Z
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	{{DISPLAYTITLE:Rolex pre-Daytona chronographs}}		{{DISPLAYTITLE:Rolex pre-Daytona chronographs}}
	{{#seo:		{{#seo:
	\|title=Rolex ~~pre~~-Daytona ~~chronographs~~ — ~~Antimagnetique, Monoblocco, 6034, 6234, 6238~~ \| BezelBase		\|title=Rolex Pre-Daytona Chronographs — 1937–1963 Guide \| BezelBase
	\|description=The Rolex chronograph line before the 1963 Cosmograph Daytona launch. Antimagnetique 2508, Monoblocco 3525 and the WWII POW watches, the 4xxx tonneau Oysters, the 6034 anti-magnetic, and the 6234 / 6238 Pre-Daytona references that hand off to the 6239.		\|description=The Rolex chronograph line before the 1963 Cosmograph Daytona launch. Antimagnetique 2508, Monoblocco 3525 and the WWII POW watches, the 4xxx tonneau Oysters, the 6034 anti-magnetic, and the 6234 / 6238 Pre-Daytona references that hand off to the 6239.
	\|keywords=Rolex chronograph, Pre-Daytona, Antimagnetique, Monoblocco, Barilotto, 2508, 3525, 3668, 3833, 4099, 4500, 4537, 4767, 5034, 6034, 6234, 6238, Valjoux 23, Valjoux 72, vintage Rolex		\|keywords=Rolex chronograph, Pre-Daytona, Antimagnetique, Monoblocco, Barilotto, 2508, 3525, 3668, 3833, 4099, 4500, 4537, 4767, 5034, 6034, 6234, 6238, Valjoux 23, Valjoux 72, vintage Rolex
			\|image=Pre-daytona chronographs vintage poster.webp
			\|image_alt=Rolex pre-Daytona chronograph reference photograph
	\|type=Article		\|type=Article
	\|og_type=article		\|og_type=article
			\|published_time=2026-04-30T03:24:59Z
			\|modified_time=2026-06-04T04:42:56Z
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	\|description=The Rolex chronograph line before the 1963 Cosmograph Daytona launch. Antimagnetique 2508, Monoblocco 3525 and the WWII POW watches, the 4xxx tonneau Oysters, the 6034 anti-magnetic, and the 6234 / 6238 Pre-Daytona references that hand off to the 6239.		\|description=The Rolex chronograph line before the 1963 Cosmograph Daytona launch. Antimagnetique 2508, Monoblocco 3525 and the WWII POW watches, the 4xxx tonneau Oysters, the 6034 anti-magnetic, and the 6234 / 6238 Pre-Daytona references that hand off to the 6239.
	\|keywords=Rolex chronograph, Pre-Daytona, Antimagnetique, Monoblocco, Barilotto, 2508, 3525, 3668, 3833, 4099, 4500, 4537, 4767, 5034, 6034, 6234, 6238, Valjoux 23, Valjoux 72, vintage Rolex		\|keywords=Rolex chronograph, Pre-Daytona, Antimagnetique, Monoblocco, Barilotto, 2508, 3525, 3668, 3833, 4099, 4500, 4537, 4767, 5034, 6034, 6234, 6238, Valjoux 23, Valjoux 72, vintage Rolex
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			{{DISPLAYTITLE:Rolex pre-Daytona chronographs}}
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	\|title=Rolex pre-Daytona chronographs — Antimagnetique, Monoblocco, 6034, 6234, 6238 \| BezelBase		\|title=Rolex pre-Daytona chronographs — Antimagnetique, Monoblocco, 6034, 6234, 6238 \| BezelBase

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	* [[Reference:Movements\|Movements]] — the Valjoux 23 family, the Valjoux 72 progression (Cal. 72B / 722 / 727), and the eventual move to Zenith and in-house calibers.		* [[Reference:Movements\|Movements]] — the Valjoux 23 family, the Valjoux 72 progression (Cal. 72B / 722 / 727), and the eventual move to Zenith and in-house calibers.
	* [[Reference:Bracelets\|Bracelets]] — the early rivet bracelets (6635, 7205) and end links fitted to the chronograph case across the line.		* [[Reference:Bracelets\|Bracelets]] — the early rivet bracelets (6635, 7205) and end links fitted to the chronograph case across the line.


			== Related references ==

			* [[Reference:daytona\|Daytona family index]]
			* [[Reference:3525\|Daytona 3525]] — the WWII 'Monoblocco' chronograph
			* [[Reference:6234\|Daytona 6234]] — pre-Daytona chronograph
			* [[Reference:6238\|Daytona 6238]] — the "pre-Daytona", direct predecessor to the Cosmograph
			* [[Reference:6239\|Daytona 6239]] — the first watch to carry the Daytona name

	== Sources ==		== Sources ==