Reference:3131 - Revision history

Admin: Resize hero: 340px -> 250px

2026-04-30T04:22:01Z

Resize hero: 340px -> 250px

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	[[File:Ref 3131 hero.jpg\|thumb\|right\|~~340px~~\|alt=Rolex Bubbleback 3131 hero\|Rolex Bubbleback 3131]]		[[File:Ref 3131 hero.jpg\|thumb\|right\|250px\|alt=Rolex Bubbleback 3131 hero\|Rolex Bubbleback 3131]]

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2026-04-29T03:21:31Z

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	{{#seo:		{{#seo:
	\|title=Rolex ~~Oyster Perpetual "~~Bubbleback~~" 3131~~ — BezelBase		\|title=Rolex 3131 Bubbleback — Production, Dial Variants, Serial Ranges \| BezelBase
	\|description=The 3131 is the reference where the Bubbleback grows up. Three years after ref 1858 introduced the Perpetual rotor in an Oyster case, Rolex simplified the…		\|description=The 3131 is the reference where the Bubbleback grows up. Three years after ref 1858 introduced the Perpetual rotor in an Oyster case, Rolex simplified the…
	\|keywords=Rolex, 3131, Bubbleback, specifications, reference guide		\|keywords=Rolex, 3131, Bubbleback, specifications, reference guide
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	\|published_time=2026-04-17T21:04:13Z		\|published_time=2026-04-17T21:04:13Z
	\|modified_time=2026-04-29T02:34:~~48Z~~		\|modified_time=2026-04-29T02:48:54Z
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	\|published_time=2026-04-17T21:04:13Z		\|published_time=2026-04-17T21:04:13Z
	\|modified_time=2026-04-~~27T13~~:30:~~11Z~~		\|modified_time=2026-04-29T02:34:48Z
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2026-04-29T02:34:48Z

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	\|published_time=2026-04-17T21:04:13Z		\|published_time=2026-04-17T21:04:13Z
	\|modified_time=2026-04-~~24T23~~:46:~~38Z~~		\|modified_time=2026-04-27T13:30:11Z
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2026-04-27T13:30:11Z

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Admin: Strip Chevalier (Colin A. White is not a pseudonym; remove confusing label)

2026-04-27T04:33:19Z

Strip Chevalier (Colin A. White is not a pseudonym; remove confusing label)

← Older revision		Revision as of 04:33, 27 April 2026
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	== Sources ==		== Sources ==
	* The Vintage Rolex Field Manual~~, Chevalier Edition~~ — ~~unknown~~, Morning Tundra		* ''The Vintage Rolex Field Manual'' — Colin A. White, Morning Tundra
	* [https://www.phillips.com/detail/rolex/NY080322/64 Phillips NY Watch Auction SEVEN Lot 64 — Rolex ref 3131 14K YG c.1946] — Phillips		* [https://www.phillips.com/detail/rolex/NY080322/64 Phillips NY Watch Auction SEVEN Lot 64 — Rolex ref 3131 14K YG c.1946] — Phillips
	* [https://www.sothebys.com/en/buy/auction/2020/watches-online-2/rolex-bubbleback-ref-3131-pink-gold-wristwatch-2 Sotheby's Watches Online — Rolex ref 3131 14K PG c.1946 silvered dial] — Sotheby's		* [https://www.sothebys.com/en/buy/auction/2020/watches-online-2/rolex-bubbleback-ref-3131-pink-gold-wristwatch-2 Sotheby's Watches Online — Rolex ref 3131 14K PG c.1946 silvered dial] — Sotheby's

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	\|description=The 3131 is the reference where the Bubbleback grows up. Three years after ref 1858 introduced the Perpetual rotor in an Oyster case, Rolex simplified the…		\|description=The 3131 is the reference where the Bubbleback grows up. Three years after ref 1858 introduced the Perpetual rotor in an Oyster case, Rolex simplified the…
	\|keywords=Rolex, 3131, Bubbleback, specifications, reference guide		\|keywords=Rolex, 3131, Bubbleback, specifications, reference guide
			\|image=Ref 3131 hero.jpg
			\|image_alt=Rolex Bubbleback 3131 hero
	\|type=article		\|type=article
			\|og_type=article
			\|published_time=2026-04-17T21:04:13Z
			\|modified_time=2026-04-24T23:46:38Z
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Admin: Trim another small batch of dense reference prose

2026-04-24T23:46:38Z

Trim another small batch of dense reference prose

← Older revision		Revision as of 23:46, 24 April 2026
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	The defining technical feature of the 3131 is its case construction. On the earlier first-generation Bubbleback architecture, the bezel, mid-case, movement-holder ring, and caseback combined as distinct parts to make the sealed Oyster unit. The two-piece case eliminates the internal ring entirely. The bezel is integral to the mid-case, turned from the same block of metal, with the lugs, the crystal seat, and the outer profile all part of a single component. The caseback screws directly into threads cut into the mid-case itself. Two pieces. That is the whole shell.		The defining technical feature of the 3131 is its case construction. On the earlier first-generation Bubbleback architecture, the bezel, mid-case, movement-holder ring, and caseback combined as distinct parts to make the sealed Oyster unit. The two-piece case eliminates the internal ring entirely. The bezel is integral to the mid-case, turned from the same block of metal, with the lugs, the crystal seat, and the outer profile all part of a single component. The caseback screws directly into threads cut into the mid-case itself. Two pieces. That is the whole shell.

	~~Several consequences follow.~~ The case is thinner than it could have been with the earlier construction, with fewer interfaces between parts and fewer tolerances to stack up. Waterproofness becomes more reliable in manufacturing because there is one fewer sealing surface to ~~get right. Service becomes simpler~~: a ~~watchmaker removes the caseback and the movement lifts out directly. Production cost drops~~, ~~with~~ fewer ~~parts~~, ~~fewer machining operations~~, and ~~fewer assembly steps~~. ~~Against those gains, Rolex accepts one~~ trade-off: the bezel is the mid-case, so damage to one ~~damages the other. For a waterproof watch destined for decades of service, Rolex evidently judged the trade-off acceptable. It never reverted~~.		The gains are easy to see: a thinner case, fewer sealing surfaces, easier service, and simpler production. The trade-off is just as clear: because the bezel is the mid-case, damage to one means damage to both.

	The 3131 case carries the Oyster Watch Co. signature on the caseback interior along with period-correct patent markings and hallmarks. Reference numbers between the lugs are not standard on 3131s; most surviving examples have the reference engraved only on the caseback interior, consistent with the pre-1948 Rolex convention. Serials appear between the lugs at 6 o’clock, following the 1926-onward Oyster standard.		The 3131 case carries the Oyster Watch Co. signature on the caseback interior along with period-correct patent markings and hallmarks. Reference numbers between the lugs are not standard on 3131s; most surviving examples have the reference engraved only on the caseback interior, consistent with the pre-1948 Rolex convention. Serials appear between the lugs at 6 o’clock, following the 1926-onward Oyster standard.
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	9K gold was a UK-market metal standard (37.5% pure gold, compared to 58.3% for 14K and 75% for 18K), permitted for hallmarking in Britain but not in most continental European markets. 9K 3131 examples exist in dealer records and represent the lower-priced end of the precious-metal range, targeted at the British Commonwealth market.		9K gold was a UK-market metal standard (37.5% pure gold, compared to 58.3% for 14K and 75% for 18K), permitted for hallmarking in Britain but not in most continental European markets. 9K 3131 examples exist in dealer records and represent the lower-priced end of the precious-metal range, targeted at the British Commonwealth market.

	~~The absence of~~ confirmed stainless steel 3131 examples is worth stating directly. Broader Bubbleback production includes steel and Rolesor extensively (1858, 3458, 2940, 2764, and 3065 all carry documented steel variants), but the 3131 as a reference appears not to have been offered in non-precious materials. The ~~precise reason~~ is ~~not documented in~~ Rolex ~~paperwork. A reasonable inference from the pattern of surviving examples is that~~ the 3131/3132 ~~pairing was positioned~~ as ~~the~~ premium two-piece Bubbleback ~~at introduction, with steel~~ and ~~Rolesor production~~ routed to other references ~~in the same family that shared the two-piece case architecture once it became the Oyster standard~~.		No confirmed stainless-steel 3131 has surfaced. The cleanest reading is that Rolex positioned the 3131/3132 pair as a premium two-piece Bubbleback pair and routed the steel side of the family through other references.

	<span id="the-suffix-system"></span>		<span id="the-suffix-system"></span>

Admin: Trim another tier of dense reference prose

2026-04-24T16:45:13Z

Trim another tier of dense reference prose

← Older revision		Revision as of 16:45, 24 April 2026
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	The 3131 is the first two-piece Oyster case Bubbleback. That single sentence carries most of the reference’s significance.		The 3131 is the first two-piece Oyster case Bubbleback. That single sentence carries most of the reference’s significance.

	Earlier ~~first-generation~~ Bubblebacks ~~(1858, 3458)~~ used a more complex case construction ~~with a separate movement-holder ring; the~~ 3131 ~~simplified this~~ to ~~a two-piece case with~~ the bezel fixed and only the caseback removable. In 1936 Rolex paired two new references on the same case platform. The 3131 carried Cal. 620 with subsidiary seconds at 6 o’clock. The 3132 carried Cal. 630 with a centre sweep seconds hand. Both used an identical two-piece ~~case: a tonneau mid-case with integrated lugs, closed at the back by a screw-down caseback~~ that ~~threaded directly into~~ the case ~~middle. No separate bezel ring. No discrete movement holder. This is the construction~~ standard that the ~~Submariner, GMT-Master, Datejust, and Daytona inherit~~.		Earlier Bubblebacks used a more complex case construction. The 3131 simplifies it to the two-piece form that becomes the main Bubbleback case standard, and that is one of the reference's real structural contributions.

	Within its own production run, the 3131 does not evolve in the way the 1016 Explorer or the 5513 Submariner do. It is a shorter-lived reference. Surviving examples span roughly 1936 through the late 1940s, and the variation happens in dials, hands, and case materials rather than in generations of movements or case revisions. The 3131 and 3132 were sold side by side. A buyer in 1938 could choose subsidiary seconds or sweep seconds in the same case, at roughly the same price, in the same metals. Most surviving examples across both references are in comparable states of scarcity, with the sub-seconds 3131 slightly more commonly encountered at auction.		Within its own production run, the 3131 does not evolve in the way the 1016 Explorer or the 5513 Submariner do. It is a shorter-lived reference. Surviving examples span roughly 1936 through the late 1940s, and the variation happens in dials, hands, and case materials rather than in generations of movements or case revisions. The 3131 and 3132 were sold side by side. A buyer in 1938 could choose subsidiary seconds or sweep seconds in the same case, at roughly the same price, in the same metals. Most surviving examples across both references are in comparable states of scarcity, with the sub-seconds 3131 slightly more commonly encountered at auction.
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	The 3131 occupies a specific position in the Bubbleback collecting hierarchy. It is less rare than the 1858, less visually dramatic than the engine-turned 3372, and less commercially significant than the 4467 Datejust. It is the first two-piece Bubbleback, and precious-metal-only, which sets a baseline price floor that the broader steel Bubbleback market does not have.		The 3131 occupies a specific position in the Bubbleback collecting hierarchy. It is less rare than the 1858, less visually dramatic than the engine-turned 3372, and less commercially significant than the 4467 Datejust. It is the first two-piece Bubbleback, and precious-metal-only, which sets a baseline price floor that the broader steel Bubbleback market does not have.

	As with ~~all~~ 1930s–1940s Rolex watches, refinished dials are ~~the norm rather than the exception~~. ~~An original unrestored dial on~~ a 3131 ~~is scarce and substantially premium-worthy. The~~ grene ~~textured surface~~, sharp applied ~~gold Arabic~~ numerals, and ~~correct aging of radium lume plots are the three strongest visible indicators of an original~~ dial~~. Mismatched~~ lume aging between dial and hands is a red flag for at least one component having been replaced. Precious-metal cases also polish much more easily than steel, and 90-year-old gold Bubblebacks have almost universally been polished at some point in their service history. The Phillips 2022 example was described as unpolished, which explains a substantial portion of its above-estimate result.		As with most 1930s–1940s Rolex watches, refinished dials are common. On a 3131 the best signals of originality are grene texture, sharp applied numerals, and dial-hand lume that has aged together.

	Hallmark verification is required. Case metal is the single largest driver of the watch’s value. A 9K gold 3131 and an 18K gold 3131 are physically similar watches with substantially different retail positions. A seller offering a 3131 in 18K PG or YG should provide clear hallmark photography. Paperwork on 3131-era Rolex watches is effectively non-existent at public auction; a surviving Rolex hangtag (Phillips 2022) or period-correct gold bracelet (Sotheby’s 51699) is unusual and adds meaningful premium, but original boxes from the 1930s–1940s are almost never present.		Hallmark verification is required. Case metal is the single largest driver of the watch’s value. A 9K gold 3131 and an 18K gold 3131 are physically similar watches with substantially different retail positions. A seller offering a 3131 in 18K PG or YG should provide clear hallmark photography. Paperwork on 3131-era Rolex watches is effectively non-existent at public auction; a surviving Rolex hangtag (Phillips 2022) or period-correct gold bracelet (Sotheby’s 51699) is unusual and adds meaningful premium, but original boxes from the 1930s–1940s are almost never present.

Admin: Trim another tier of dense reference prose

2026-04-24T16:41:07Z

Trim another tier of dense reference prose

← Older revision		Revision as of 16:41, 24 April 2026
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	Cal. 620 is a 9¾’’’ automatic movement with 17 jewels, 18,000 bph, and a 35–41 hour power reserve depending on rotor winding state. The movement blank measures 26.4mm in diameter by 7.5mm in height, wider and flatter than it looks given how much of the 3131’s perceived thickness comes from the caseback dome rather than the movement itself.		Cal. 620 is a 9¾’’’ automatic movement with 17 jewels, 18,000 bph, and a 35–41 hour power reserve depending on rotor winding state. The movement blank measures 26.4mm in diameter by 7.5mm in height, wider and flatter than it looks given how much of the 3131’s perceived thickness comes from the caseback dome rather than the movement itself.

	Architecturally, ~~Cal~~. 620 is ~~an evolution of~~ the ~~Cal~~. 520 that powered the first Bubblebacks. Both share the same 360-degree unidirectional rotor, both use a Swiss lever escapement, both carry a Breguet overcoil hairspring, and both descend from the manual-wind Cal. 600 base. Cal. 620 upgrades Cal. 520 in two ways that matter. The ~~first~~ is ~~the Super Balance, Rolex’s simplified monometallic balance introduced in 1935~~ that ~~replaced the cut bimetallic~~ balance ~~used on earlier movements; less finicky to regulate~~ and ~~more stable across temperature ranges. The second is the rotor mass. The Cal. 620 rotor is physically larger~~, which ~~improves winding efficiency at the cost of case thickness. This~~ is the ~~direct reason the 3131’s dome is~~ more pronounced than the ~~1858’s~~.		Architecturally, cal. 620 is the next step after cal. 520. The useful point is that it improves balance stability and winding efficiency, which is why the 3131 carries a more pronounced Bubbleback dome than the earliest 1858 generation.

	Cal. 620 is unidirectional: the rotor spins freely in one direction and winds in the other. True bidirectional winding in a Rolex movement arrives only with Cal. 1030 in 1950, which is also the movement that ends the Bubbleback era by enabling a thin flat caseback.		Cal. 620 is unidirectional: the rotor spins freely in one direction and winds in the other. True bidirectional winding in a Rolex movement arrives only with Cal. 1030 in 1950, which is also the movement that ends the Bubbleback era by enabling a thin flat caseback.
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	The 3131 sits in a period when Rolex dials were still largely bespoke (retailers could specify signatures, markers, and finishing within a catalog of options), and the result is a dial variety that does not map neatly onto production generations. White and silvered dials are the most commonly encountered baseline, often with applied gold Arabic numerals and a sub-seconds register at 6. Cream and ivory dials appear on yellow gold cases with the same marker convention but a softer background. Pink and salmon dials are the signature configuration for 18K PG and 14K PG cases. The Sotheby’s Watches Weekly 2020 example (case 51699, 18K PG) carries a pink dial matched to the case.		The 3131 sits in a period when Rolex dials were still largely bespoke (retailers could specify signatures, markers, and finishing within a catalog of options), and the result is a dial variety that does not map neatly onto production generations. White and silvered dials are the most commonly encountered baseline, often with applied gold Arabic numerals and a sub-seconds register at 6. Cream and ivory dials appear on yellow gold cases with the same marker convention but a softer background. Pink and salmon dials are the signature configuration for 18K PG and 14K PG cases. The Sotheby’s Watches Weekly 2020 example (case 51699, 18K PG) carries a pink dial matched to the case.

	The case-matched dial is the signature look. Beige ~~dials sit between cream and pink. Black dials are very rare on~~ the ~~3131 and carry a premium that reflects both their scarcity and the striking contrast of~~ black ~~lacquer against yellow or rose gold, a configuration that ran against~~ the ~~dominant design language of the era. Applied gold Arabic numerals are the most commonly documented marker convention~~, ~~with batons~~ and ~~Arabic-plus-baton combinations also appearing. Grene textured dial surfaces (a lightly grained or “hammered” finish) appear on particularly well-preserved examples and are~~ one of the ~~features~~ that ~~separates~~ a ~~top-tier original 3131~~ dial ~~from a~~ refinished ~~one; refinishers generally cannot reproduce the grene texture convincingly~~.		The case-matched dial is the signature look. Beige is the baseline, black is the rare premium look, and genuine grene texture is one of the best signs that a dial has not been refinished.

	Three hand configurations appear. Luminous pencil hands are the most common, with straight pencil-style hour and minute hands and radium fill that has aged to a warm orange or brown patina. Feuille (leaf) hands appear on a smaller subset, typically paired with silvered or cream dials, and give the watch a more formal dress-watch character. Spade hands are the rarest of the three, with only a handful of documented examples, typically on early pre-1940 production.		Three hand configurations appear. Luminous pencil hands are the most common, with straight pencil-style hour and minute hands and radium fill that has aged to a warm orange or brown patina. Feuille (leaf) hands appear on a smaller subset, typically paired with silvered or cream dials, and give the watch a more formal dress-watch character. Spade hands are the rarest of the three, with only a handful of documented examples, typically on early pre-1940 production.