Reference:2940 - Revision history

Klaudiusz: Tighten 2940 production and authentication wording

2026-09-29T08:36:38Z

Tighten 2940 production and authentication wording

Klaudiusz: Deep audit: Bubbleback grounding, source cleanup, image gallery, and anti-slop prose

2026-09-29T02:31:59Z

Deep audit: Bubbleback grounding, source cleanup, image gallery, and anti-slop prose

← Older revision		Revision as of 02:31, 29 September 2026
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	See also the [[Reference:bubbleback\|Bubbleback family index]], [[Reference:Movements\|movement reference]], [[Reference:Bracelets\|bracelet & clasp guide]], and [[Reference:Serial-numbers\|serial numbers by year]].		See also the [[Reference:bubbleback\|Bubbleback family index]], [[Reference:Movements\|movement reference]], [[Reference:Bracelets\|bracelet & clasp guide]], and [[Reference:Serial-numbers\|serial numbers by year]].

			<gallery mode="packed" heights="180">
			File:Ref 2940 hero.webp\|1942 stainless-steel 2940
			File:Ref 2940 full.webp\|Rose-numeral dial example
			File:Ref 2940 profile.webp\|Bubbleback case profile
			File:Ref 2940 dial-detail.webp\|Center-seconds dial detail
			</gallery>

	== Sources ==		== Sources ==
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	* [https://www.bobswatches.com/rolex-blog/watch-review/rolex-bubble-back.html Bob's Watches — Rolex Bubble Back Collector's Guide] — Bob's Watches		* [https://www.bobswatches.com/rolex-blog/watch-review/rolex-bubble-back.html Bob's Watches — Rolex Bubble Back Collector's Guide] — Bob's Watches
	* ''swisswatchexpo bubbleback''		* ''swisswatchexpo bubbleback''
	* ~~[https://www.watchuseek.com/~~ WatchUSeek — 2940 threads]		* WatchUSeek — 2940 discussion threads used as collector leads
	* [https://www.tapatalk.com/groups/vintagerolexforum/ Vintage Rolex Forum — 2940 hooded debate]		* [https://www.tapatalk.com/groups/vintagerolexforum/ Vintage Rolex Forum — 2940 hooded debate]
	* [https://www.1stdibs.com/ 1stDibs — 2940 listings]		* [https://www.1stdibs.com/ 1stDibs — 2940 listings]
	* [https://www.rolexforums.com/ Rolex Forums — 2940]		* [https://www.rolexforums.com/~trfcom/showthread.php?t=372044 Rolex Forums, “Another Bubbleback question” — reference 2940 engraving discussion]
			* [https://www.rolex.com/oyster-story/visionary-undertaking/at-one-with-movement Rolex Oyster Story: “At one with the movement”]; Rolex, 1931 Perpetual rotor history
	* [https://calibercorner.com/ Caliber Corner — 630]		* [https://calibercorner.com/ Caliber Corner — 630]

	[[Category:Bubbleback]]		[[Category:Bubbleback]]

Klaudiusz: Deep audit: grounded Bubbleback case, dial, market and image claims

2026-09-28T21:18:12Z

Deep audit: grounded Bubbleback case, dial, market and image claims

Show changes

Admin: Layout: restore the original lead caption

2026-09-06T22:59:47Z

Layout: restore the original lead caption

← Older revision		Revision as of 22:59, 6 September 2026
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	<div class="rp-lead">		<div class="rp-lead">
	[[File:Ref 2940 hero.webp\|thumb\|center\|640px\|alt=~~Rolex 2940~~ Bubbleback\|~~Rolex 2940~~ Bubbleback]]		[[File:Ref 2940 hero.webp\|thumb\|center\|640px\|alt=1942 steel Bubbleback\|1942 steel Bubbleback]]
	</div>		</div>

Admin: Layout: hero refreshed

2026-09-06T22:54:23Z

Layout: hero refreshed

← Older revision		Revision as of 22:54, 6 September 2026
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	<div class="rp-lead">		<div class="rp-lead">
	[[File:Ref 2940 hero.webp\|thumb\|center\|640px\|alt=~~1942 steel~~ Bubbleback\|~~1942 steel~~ Bubbleback]]		[[File:Ref 2940 hero.webp\|thumb\|center\|640px\|alt=Rolex 2940 Bubbleback\|Rolex 2940 Bubbleback]]
	</div>		</div>

Admin: Layout: hero promoted to lead

2026-09-06T22:29:36Z

Layout: hero promoted to lead

← Older revision		Revision as of 22:29, 6 September 2026
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	<small>[[Reference:bubbleback\|Bubbleback]] › '''2940'''</small>		<small>[[Reference:bubbleback\|Bubbleback]] › '''2940'''</small>
	[[File:Ref 2940 hero.webp\|thumb\|~~right~~\|~~250px~~\|alt=~~Rolex 2940~~ Bubbleback ~~steel 1942~~\|1942 steel Bubbleback]]
			<div class="rp-lead">
			[[File:Ref 2940 hero.webp\|thumb\|center\|640px\|alt=1942 steel Bubbleback\|1942 steel Bubbleback]]
			</div>

	The 2940 is the wartime Bubbleback: the steel, center-seconds, export-friendly expression of the earlier 3131 formula. Its broad dial range reflects the few markets Rolex still had open in the 1940s.		The 2940 is the wartime Bubbleback: the steel, center-seconds, export-friendly expression of the earlier 3131 formula. Its broad dial range reflects the few markets Rolex still had open in the 1940s.

Admin: site-wide: layout classes (core-facts card, breadcrumb, entry-point cards)

2026-09-05T01:21:09Z

site-wide: layout classes (core-facts card, breadcrumb, entry-point cards)

← Older revision		Revision as of 01:21, 5 September 2026
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	}}		}}

	<small>[[Reference:bubbleback\|Bubbleback]] -> '''2940'''</small>		<small>[[Reference:bubbleback\|Bubbleback]] › '''2940'''</small>
	[[File:Ref 2940 hero.webp\|thumb\|right\|250px\|alt=Rolex 2940 Bubbleback steel 1942\|1942 steel Bubbleback]]		[[File:Ref 2940 hero.webp\|thumb\|right\|250px\|alt=Rolex 2940 Bubbleback steel 1942\|1942 steel Bubbleback]]

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

	{\| class="wikitable"		{\| class="wikitable rp-facts"
	\|-		\|-
	! detail		! detail

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

2026-09-05T00:37:14Z

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

← Older revision		Revision as of 00:37, 5 September 2026
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	{{DISPLAYTITLE:Rolex 2940 Bubbleback}}		{{DISPLAYTITLE:Rolex 2940 Bubbleback}}
	{{#seo:		{{#seo:
	\|title=Rolex Bubbleback 2940 (1940–1949) — Production & Dial Guide \| ~~BezelBase~~		\|title=Rolex Bubbleback 2940 (1940–1949) — Production & Dial Guide \| Rolexopedia
	\|description=The 2940 is the wartime Bubbleback: the steel, center-seconds, export-friendly expression of the earlier 3131 formula. Its broad dial range reflects the few markets Rolex still had open in the 1940s.		\|description=The 2940 is the wartime Bubbleback: the steel, center-seconds, export-friendly expression of the earlier 3131 formula. Its broad dial range reflects the few markets Rolex still had open in the 1940s.
	\|image=Ref 2940 hero.webp		\|image=Ref 2940 hero.webp

Admin: Fix ligne-mark bold bug: replace ''' with ′′′ prime marks

2026-08-08T17:59:25Z

Fix ligne-mark bold bug: replace ''' with ′′′ prime marks

← Older revision		Revision as of 17:59, 8 August 2026
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	\|-		\|-
	\| movement		\| movement
	\| Cal. ~~9¾'''~~, 17 jewels (some 18j); some examples Cal. 630		\| Cal. 9¾′′′, 17 jewels (some 18j); some examples Cal. 630
	\|-		\|-
	\| case materials		\| case materials
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	[[File:Ref 2940 full.webp\|thumb\|right\|250px\|alt=2940 rose-numeral dial Phillips lot\|Phillips Geneva 2015 lot, rose-numeral dial]]		[[File:Ref 2940 full.webp\|thumb\|right\|250px\|alt=2940 rose-numeral dial Phillips lot\|Phillips Geneva 2015 lot, rose-numeral dial]]
	The 2940 is the volume wartime Bubbleback. The 3131 and its sweep-seconds twin 3132 had proven in 1936 that the two-piece Oyster could be manufactured at scale; the 2940 is the reference that made the same case architecture available in steel and inexpensive gold cap. It carries the sweep-seconds configuration that the 3132 pioneered, a center-mounted seconds hand running off Cal. ~~9¾'''~~ rather than a subsidiary register at 6, and pairs it with a case sized for a masculine wartime wrist. Production runs from roughly 1940 through 1949, with the concentrated peak falling in the five years from 1942 through 1947.		The 2940 is the volume wartime Bubbleback. The 3131 and its sweep-seconds twin 3132 had proven in 1936 that the two-piece Oyster could be manufactured at scale; the 2940 is the reference that made the same case architecture available in steel and inexpensive gold cap. It carries the sweep-seconds configuration that the 3132 pioneered, a center-mounted seconds hand running off Cal. 9¾′′′ rather than a subsidiary register at 6, and pairs it with a case sized for a masculine wartime wrist. Production runs from roughly 1940 through 1949, with the concentrated peak falling in the five years from 1942 through 1947.

	Within the Bubbleback range, the 2940 sits beside the sub-seconds 2764, the more mixed-metal 3065, and the engine-turned 3372. Steel examples are the standard configuration. 14K gold-top over steel sits above them, and solid 9K gold is the scarcest material. The documented serial range runs from the low 200,000s to the high 600,000s, which fits roughly 1942 to 1949. Unlike later sports references, the 2940 does not break into neat generations. The variation is in dials, hands, and case metal.		Within the Bubbleback range, the 2940 sits beside the sub-seconds 2764, the more mixed-metal 3065, and the engine-turned 3372. Steel examples are the standard configuration. 14K gold-top over steel sits above them, and solid 9K gold is the scarcest material. The documented serial range runs from the low 200,000s to the high 600,000s, which fits roughly 1942 to 1949. Unlike later sports references, the 2940 does not break into neat generations. The variation is in dials, hands, and case metal.
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	The 2940's movement is non-hacking. Pulling the crown to the setting position stops the hands from advancing but the seconds continue to sweep; setting to the exact second requires a fractional backlash adjustment that is second nature on contemporary vintage Rolex but foreign to any Rolex made after the introduction of hacking seconds in the 1970s.		The 2940's movement is non-hacking. Pulling the crown to the setting position stops the hands from advancing but the seconds continue to sweep; setting to the exact second requires a fractional backlash adjustment that is second nature on contemporary vintage Rolex but foreign to any Rolex made after the introduction of hacking seconds in the 1970s.

	Cal. 630 is cited on some 2940 examples and is the formal numbered caliber for the ~~9¾'''~~ sweep-seconds configuration. The two designations refer to the same movement family under different naming conventions. The ligne measurement (~~9¾'''~~) is older, and the numbered caliber (630) is the catalog reference Rolex used in service documentation. A 2940 described with Cal. ~~9¾'''~~ and a 2940 described with Cal. 630 are, in practice, the same watch.		Cal. 630 is cited on some 2940 examples and is the formal numbered caliber for the 9¾′′′ sweep-seconds configuration. The two designations refer to the same movement family under different naming conventions. The ligne measurement (9¾′′′) is older, and the numbered caliber (630) is the catalog reference Rolex used in service documentation. A 2940 described with Cal. 9¾′′′ and a 2940 described with Cal. 630 are, in practice, the same watch.

	<span id="dial-variants"></span>		<span id="dial-variants"></span>

Admin: SEO: clickable title + og:image + timestamps

2026-08-04T00:20:05Z

SEO: clickable title + og:image + timestamps

← Older revision		Revision as of 00:20, 4 August 2026
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	\|og_type=article		\|og_type=article
	\|published_time=2026-04-17T22:14:06Z		\|published_time=2026-04-17T22:14:06Z
	\|modified_time=2026-07-~~18T12~~:52:~~32Z~~		\|modified_time=2026-08-04T00:11:36Z
	\|robots=index,follow,max-image-preview:large		\|robots=index,follow,max-image-preview:large
	}}		}}