Reference:2240 - Revision history

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2026-09-05T01:21:04Z

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

2026-09-05T00:37:09Z

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← Older revision		Revision as of 00:37, 5 September 2026
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	{{#seo:		{{#seo:
	\|title=Rolex 2240 Bubbleback — Self-Winding Oyster Perpetual \| ~~BezelBase~~		\|title=Rolex 2240 Bubbleback — Self-Winding Oyster Perpetual \| Rolexopedia
	\|description=Rolex reference 2240: two self-winding Oyster Perpetual catalogue records, movement and dial evidence, and the unresolved Bubbleback caseback attribution.		\|description=Rolex reference 2240: two self-winding Oyster Perpetual catalogue records, movement and dial evidence, and the unresolved Bubbleback caseback attribution.
	\|image=Ref 2240 hero.webp		\|image=Ref 2240 hero.webp

Admin: Correct 2240 auction corpus, provisional Bubbleback attribution, and SCOC chronology

2026-08-23T22:37:25Z

Correct 2240 auction corpus, provisional Bubbleback attribution, and SCOC chronology

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	{{DISPLAYTITLE:Rolex 2240 Bubbleback}}		{{DISPLAYTITLE:Rolex 2240 Bubbleback}}
			{{#seo:
			\|title=Rolex 2240 Bubbleback — Self-Winding Oyster Perpetual \| BezelBase
			\|description=The 2240 is a self-winding Oyster Perpetual in a 32mm stainless steel tonneau case, one of the few numbers in its collector-list cohort that still holds up as a genuine Bubbleback once the evidence is checked.
			\|image=Ref 2240 hero.webp
			\|type=article
			}}
	<small>[[Reference:bubbleback\|Bubbleback]] -> '''2240'''</small>		<small>[[Reference:bubbleback\|Bubbleback]] -> '''2240'''</small>

Admin: Text audit: voice, clarity, source links

2026-08-23T04:25:01Z

Text audit: voice, clarity, source links

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← Older revision		Revision as of 22:46, 22 August 2026
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			{{DISPLAYTITLE:Rolex 2240 Bubbleback}}
	The 2240 is a self-winding Oyster Perpetual in a 32mm stainless steel tonneau case, and it is		The 2240 is a self-winding Oyster Perpetual in a 32mm stainless steel tonneau case, and it is
	the one reference in its cohort that still has a claim to the Bubbleback name once the		the one reference in its cohort that still has a claim to the Bubbleback name once the

Admin: Import reference 2240 article

2026-08-22T22:46:36Z

Import reference 2240 article

New page

The 2240 is a self-winding Oyster Perpetual in a 32mm stainless steel tonneau case, and it is
the one reference in its cohort that still has a claim to the Bubbleback name once the
evidence is checked. The collector list that put the 2240 into circulation also lists the 1873
and the 2765, and both of those turn out to be hand-wound flat-back Oysters wearing the
Bubbleback's case but none of its mechanics. The 2240 is different: both Antiquorum examples
are described as centre-second and self-winding, on a 9¾-ligne movement, which is the size
Rolex used for its automatic Perpetual calibers and not the 10 to 10½ lignes of the manual
flatbacks.

The thing the nickname actually refers to went undocumented for thirty years. Neither 1995
catalogue says whether the caseback is domed, and neither of their photographs shows it. A third
example surfaced in March 2026 at a general auctioneer in Nottingham, catalogued as a ref.
2240 and photographed from the back, and that back is domed. It is the first image of a 2240
caseback in the public record. It is also one non-specialist house's attribution on a watch
whose dial reads only Rolex Oyster, without the Perpetual signature both Antiquorum examples
carry, which strengthens the Bubbleback reading without closing it.

It is still, by some distance, the least seen watch in the group. Three lots exist in the
public record: two Antiquorum sales in 1995 and one English provincial sale in 2026.

[[File:Ref 2240 hero.webp|thumb|right|250px|alt=Rolex 2240 Oyster Perpetual with mat silver dial and applied gold indexes|Mat silver dial with applied gold indexes, the Geneva lot]]

==Core facts==

{| class="wikitable"
|-
! detail
! value
|-
| reference
| 2240
|-
| family
| Bubbleback (Oyster Perpetual)
|-
| production
| 1930s or 1940s; catalogues disagree, no firm years documented
|-
| case diameter
| 32mm
|-
| case shape
| tonneau
|-
| case
| polished and satined, screwed back and crown, waterproof
|-
| caseback profile
| domed, coin-edged screw-down back on the 2026 Arthur Johnson example; neither 1995 catalogue states it and neither 1995 photograph shows it
|-
| bezel
| smooth, polished
|-
| crystal
| acrylic
|-
| crown
| screw-down
|-
| winding
| self-winding
|-
| seconds
| centre seconds
|-
| movement
| 9¾ lignes, rhodium-plated, 19 jewels, lever escapement, monometallic balance, self-compensating Breguet balance-spring. No caliber number published
|-
| case materials
| stainless steel (all three documented examples)
|-
| dials documented
| mat silver with applied gold indexes; mat silver with painted Arabic numerals, bâton radium hands on both; silvered sector dial with applied Roman numerals and gilt leaf hands
|-
| dial designations
| "Oyster Perpetual, Superlative Chronometer, Officially Certified"; "Oyster Perpetual Chronomètre"; "Rolex Oyster"
|}

==Where it sits in the line==

Two details separate the 2240 from the Bubblebacks that get written about. It has centre
seconds rather than the sub-seconds register at six o'clock that the earliest Perpetuals
carried, and it has nineteen jewels against the seventeen of the Cal. 520 and Cal. 620
families that powered the reference's better-known neighbours.

That combination places it later in the Bubbleback story than the 1933-era three-piece watches
and squarely among the mature automatics — the generation running on the two-piece Oyster case
that arrived in 1936 with the 3131 and 3132. Centre-seconds Perpetuals of this era are well
attested elsewhere in the family; catalogued 2940 examples carry "luminous filled sword hands,
center seconds", so the layout is not anomalous for the period. It is simply not the layout
most people picture when they hear Bubbleback.

Where exactly the 2240 falls inside that window is the problem, and the two surviving lots
make it worse rather than better. Antiquorum dated its Geneva example to the 1940s and its
Hong Kong example to the 1930s, two months apart, in the same year. Both readings stand in the
record. The 1936 start year that circulates for the reference comes from the same unverified
collector list that mis-assigns its neighbours, and has no independent support behind it.

==Production outline==

The public record for the 2240 consists of three lots. Two are Antiquorum sales from 1995:
Geneva at the Hôtel des Bergues on 22 April, lot 304, and Hong Kong at the Hotel Furama
Kempinski on 14 June, lot 29. A full sweep of the house's archive, which reaches back to 1974,
returns nothing else, and no lot surfaced at Phillips, Sotheby's, Christie's, Bonhams or
Heritage. The third is later and a great deal humbler: Arthur Johnson & Sons, a general
auctioneer in Nottingham, sold one as lot 7287 in a mixed Saturday sale on 14 March 2026,
catalogued in a single line as an Oyster Bubbleback, ref. 2240, with an automatic movement.

No lot page published a case number, so no serial anchor exists and no production window can
be constructed from observed examples. No production figures appear in any documented source.
All three documented watches are stainless steel; whether Rolex built the 2240 in gold, gold
shell or two-tone, as it did across much of the contemporary range, is unknown.

There is a plausible reason the reference is so scarce in the record, offered here as
speculation rather than fact. Both Antiquorum sales predate the internet-era auction archives
that most collector research now runs on. The 2026 lot shows the other half of the problem: it
passed through a provincial general auctioneer, described in one line, indexed nowhere that
vintage Rolex collectors habitually look. A reference can stay invisible by selling in the
wrong century or in the wrong room.

==Movement notes==

Nine and three-quarter lignes, rhodium-plated, nineteen jewels, lever escapement,
monometallic balance, self-compensating Breguet balance-spring, self-winding, centre seconds.
Both Antiquorum catalogues give that specification word for word, independently, on opposite
sides of the world and two months apart.

The ligne size is the most useful number in the description, because it is the one that
places the watch. Nine and three-quarter lignes is the size of Rolex's automatic Perpetual
movements — the lineage running from the Cal. 520 of 1933 through the 620 and its
sweep-seconds successors. The manual-wind flat-back Oysters Rolex was building alongside them
run larger, at 10 to 10½ lignes; all three documented examples of the neighbouring ref 2765
measure in that range. The 2240's movement therefore sits inside the automatic family on its
dimensions alone, which is independent corroboration of the self-winding descriptions rather
than a restatement of them.

Neither catalogue names a caliber, and this article does not supply one. The 19-jewel
centre-seconds configuration is architecturally distinct from the 17-jewel sub-seconds Cal.
520 and Cal. 620 that powered the earlier Bubblebacks, and it would be easy to reason from
that to a specific sweep-seconds caliber. No documented source makes that attribution for the
# The ligne size, the jewel count, the escapement, the balance and the seconds layout are
what the record supports.

==Dial map==

[[File:Ref 2240 dial-variant-painted-arabic.webp|thumb|right|250px|alt=Rolex 2240 mat silver dial with painted Arabic numerals at every hour|Painted Arabic numerals and outer minute track, the Hong Kong lot]]

Three dials are documented, one per lot, and the sale photographs confirm all three.

The Geneva example carries a mat silver dial with applied gold indexes and radium-filled
bâton hands, reading Oyster Perpetual below the coronet and carrying its chronometer
designation above six o'clock. The Hong Kong example is the more obviously pre-war of the
two: mat silver again, but with painted Arabic numerals at every hour, an outer minute track
with five-minute markers, Chronomètre above six, and the same radium-filled bâton hands.

[[File:Ref 2240 dial-variant-roman.webp|thumb|right|250px|alt=Rolex 2240 silvered sector dial with applied Roman numerals and gilt leaf hands|Applied Roman numerals on a sector-style dial signed Rolex Oyster, the Nottingham lot]]

The Nottingham watch is the outlier, and the way it differs matters more than the way it
looks. Its dial is silvered with a faint sector pattern, applied Roman numerals at the even
hours and applied batons at the odd ones, a printed outer minute track, gilt leaf hands and a
centre seconds hand. The surface is heavily crazed and plainly unrestored. What it does not
carry is the word Perpetual: the signature reads Rolex Oyster and nothing else, where both
Antiquorum dials name the watch an Oyster Perpetual and give a chronometer designation.
Rolex's self-winding watches of this period almost always say so on the dial, so an original
Rolex Oyster dial on a watch sold as an automatic 2240 is a genuine discrepancy and is
recorded here as one.

Applied indexes against painted Arabics is a real stylistic split and not a cataloguing quirk,
and it maps onto the two dating readings the catalogues give: the painted-Arabic Hong Kong
watch reads as the earlier of the pair. Three examples is not enough to call that a production
sequence, but it is enough to say the reference was built with more than one dial treatment.

One detail on the Geneva dial deserves a flag rather than a conclusion. Its lot title gives
the designation as Superlative Chronometer, Officially Certified, wording generally associated
with a later period than the 1940s that the same lot assigns the watch. That could point to a
later example, a replacement dial, or simply Antiquorum paraphrasing in the title. The
chronology of Rolex's shift between the two chronometer designations has not been checked
against independent sources here, so nothing is concluded from it.

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

Stainless steel, tonneau-shaped, 32mm, polished and satin-finished, with screwed back and
screw-down crown. Smooth polished bezel and an acrylic crystal, as the era requires. The Hong
Kong catalogue adds one word the Geneva one does not: it calls the case massive, Antiquorum's
term for a case with real substance to it.

The caseback was the open question for thirty years, and it is the one that matters most.
Neither 1995 catalogue states whether it is domed. Both give the case description in full and
both stop at "screwed back and crown". The two Antiquorum photographs are front three-quarter
views on leather straps, and neither shows the back at all.

[[File:Ref 2240 caseback.webp|thumb|right|300px|alt=Domed coin-edged screw-down caseback of a Rolex 2240 on a black leather strap|The domed, coin-edged screw-down back of the Nottingham example, the first 2240 caseback photographed in the public record]]

The Nottingham sale turned the watch over. Its fifth photograph is a caseback view, and the
back is a pronounced dome seated inside a coin-edged screw ring, the profile the nickname
describes. The crown stands proud of the case in the same frame, which fits the one condition
note the lot carried: the crown would not screw down and wanted attention.

That earlier silence was never as damning as it looked, because the catalogues of the period
do not describe caseback doming even when the watch is unambiguously a Bubbleback. Christie's
catalogued a ref 2764 as an Oyster Perpetual Bubble Back in the lot title and then described
it in body text as a 9¾-ligne, 19-jewel, sweep-seconds movement in a two-part 32mm case with a
domed crystal and a screw-down back and crown. The only thing domed in that description is the
crystal. Strip the title away and it reads exactly like the two Antiquorum 2240 lots. The formula does
not discriminate, which means the 2240's description is consistent with a Bubbleback and
simply fails to settle the question.

Everything else points the same way. That Christie's 2764 specification — 9¾ lignes, nineteen
jewels, sweep seconds, 32mm, screw-down back — is the 2240's specification line for line. And
the flat-backed automatics that make self-winding an insufficient test are a later development
in the 6000-series references, arriving once Rolex had slimmed the calibers enough to drop the
bulge. A 32mm self-winding tonneau Oyster running a 9¾-ligne movement in the late 1930s or
1940s sits before that change.

So the reasonable reading is that the 2240 is a Bubbleback, and there is now a photograph of a
domed back on a watch catalogued as one. The reading is better supported than it was and still
short of settled. That photograph comes from a general auctioneer running a mixed Saturday
sale, not from a watch specialist; no case number was published to anchor the attribution
independently; and the same watch wears a Rolex Oyster dial without the Perpetual signature
both Antiquorum examples carry. A specialist cataloguing of that watch, or a case number,
would close the question.

==Bracelets, end links, and clasps==

Nothing is documented. Neither lot was sold on a Rolex bracelet, and no period fitment for the
reference appears anywhere in the surfaced record.

==Auction record==

{| class="wikitable"
|-
! Venue
! Date
! Lot
! Dated by catalogue
! Dial
! Estimate
! Result
|-
| Antiquorum, Geneva (Hôtel des Bergues)
| 1995-04-22
| 304
| 1940s
| Mat silver, applied gold indexes, bâton radium hands
| CHF 2,600–2,800 (USD 2,200–2,400)
| Not published
|-
| Antiquorum, Hong Kong (Hotel Furama Kempinski)
| 1995-06-14
| 29
| 1930s
| Mat silver, painted Arabic numerals, bâton radium hands
| HKD 15,000–18,000 (USD 2,000–2,200)
| Not published
|-
| Arthur Johnson & Sons, Nottingham (The Saturday Auctions)
| 2026-03-14
| 7287
| Not dated
| Silvered sector, applied Roman numerals, gilt leaf hands
| Not published
| GBP 680 hammer
|}

Neither Antiquorum lot page carries a realised price, so for thirty years the reference had no
auction result on record at all. What it had instead was two estimates set within about ten
percent of each other by the same house in the same year, on two continents, roughly USD
2,000–2,400 either way. The single realised figure the reference now has is the GBP 680 hammer
at Nottingham in 2026, which prices a worn, unrestored watch with a crown fault in a sale that
was not looking for a Rolex collector. Three data points spread over thirty-one years, two of
them unrealised estimates, do not describe a market, and no attempt to read one is made here.

What the three lots do establish is narrower and more useful: that the reference exists, that
the two specialist-catalogued examples are self-winding on a 9¾-ligne movement with centre
seconds and nineteen jewels in a 32mm steel case, that it appeared with at least three dial
treatments, and that a watch catalogued as a 2240 has a domed back.

== Related references ==

* [[Reference:2764|Bubbleback 2764]] — Cal. 620N "Super Precision"
* [[Reference:2940|Bubbleback 2940]] — centre-seconds contemporary
* [[Reference:3131|Bubbleback 3131]] — the 1936 two-piece case transition
* [[Reference:2765|Oyster Chronometer 2765]] — the manual flat-back that shares the list but not the mechanics
* [[Reference:1873|Oyster Royal 1873]] — manual flat-back Oyster

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]].

== Sources ==

* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-118-304 "Rolex Oyster Perpetual, Superlative Chronometer, Officially Certified, Ref. 2240", Antiquorum, 1995-04-22]
* [https://catalog.antiquorum.swiss/en/lots/rolex-lot-120-29 "Rolex Oyster Perpetual Chronometre, Ref. 2240", Antiquorum, 1995-06-14]
* [https://www.arthurjohnson.co.uk/catalogue/lot/666399e1d8d806483b36d5f21241ba50/1d509dfe86f02da2d7cbda445ef6ff1f/the-saturday-auctions-14th-march-2026/ "Rolex - an Oyster 'Bubbleback' wristwatch, ref. 2240, stainless steel case, automatic movement", Arthur Johnson & Sons, 2026-03-14]
* [https://www.hodinkee.com/articles/the-rolex-bubbleback-and-why-it-still-matters "Buying, Selling, & Collecting: The Rolex Bubbleback And Why It Still Matters", Hodinkee]
* [https://robbreport.com/style/watch-collector/lists/rolex-bubbleback-watches-collector-guide-1931-1950s-1235893131/ "A Collector's Guide to Rolex Bubbleback Watches, From 1931 to the 1950s", Robb Report]
* "List of Bubbleback models (user w-v-m)", RolexForums
* [https://www.christies.com/en/lot/lot-5091681 "ROLEX, OYSTER PERPETUAL BUBBLE BACK REF. 2764 CALIFORNIA DIAL, STAINLESS STEEL SELF-WINDING WRISTWATCH WITH SWEEP SECONDS", Christie's]
* [https://www.bobswatches.com/rolex-blog/watch-review/rolex-bubble-back.html "Rolex Bubble Back History: A Comprehensive Collector's Guide", Bob's Watches]

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

← Older revision		Revision as of 04:25, 23 August 2026
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	{{DISPLAYTITLE:Rolex 2240 Bubbleback}}		{{DISPLAYTITLE:Rolex 2240 Bubbleback}}
			<small>[[Reference:bubbleback\|Bubbleback]] -> '''2240'''</small>

	The 2240 is a self-winding Oyster Perpetual in a 32mm stainless steel tonneau case, and it is		The 2240 is a self-winding Oyster Perpetual in a 32mm stainless steel tonneau case, and it is
	the one reference in its cohort that still has a claim to the Bubbleback name once the		the one reference in its cohort that still has a claim to the Bubbleback name once the
	evidence is checked. The collector list that put the 2240 into circulation also lists the 1873		evidence is checked. The collector list that put the 2240 into circulation also lists the 1873
	and the 2765, and both of those turn out to be hand-wound flat-back Oysters ~~wearing~~ the		and the 2765, and both of those turn out to be hand-wound flat-back Oysters, sharing the
	Bubbleback's ~~case but none of~~ its mechanics. The 2240 is different: both Antiquorum examples		tonneau silhouette but neither the Bubbleback's caseback nor its mechanics. The 2240 is different: both Antiquorum examples
	are described as centre-second and self-winding, on a 9¾-ligne movement, which is the size		are described as centre-second and self-winding, on a 9¾-ligne movement, which is the size
	Rolex used for its automatic Perpetual calibers and not the 10 to 10½ lignes of the manual		Rolex used for its automatic Perpetual calibers and not the 10 to 10½ lignes of the manual
Line 85:		Line 87:
	families that powered the reference's better-known neighbours.		families that powered the reference's better-known neighbours.

	That combination places it later in the Bubbleback story than the 1933-era ~~three~~-piece watches		That combination places it later in the Bubbleback story than the 1933-era four-piece watches
	and squarely among the mature automatics — the generation running on the two-piece Oyster case		and squarely among the mature automatics — the generation running on the two-piece Oyster case
	that arrived in 1936 with the 3131 and 3132. Centre-seconds Perpetuals of this era are well		that arrived in 1936 with the 3131 and 3132. Centre-seconds Perpetuals of this era are well
Line 102:		Line 104:
	The public record for the 2240 consists of three lots. Two are Antiquorum sales from 1995:		The public record for the 2240 consists of three lots. Two are Antiquorum sales from 1995:
	Geneva at the Hôtel des Bergues on 22 April, lot 304, and Hong Kong at the Hotel Furama		Geneva at the Hôtel des Bergues on 22 April, lot 304, and Hong Kong at the Hotel Furama
	Kempinski on 14 June, lot 29. ~~A full sweep of the house~~'s archive~~, which~~ reaches back to 1974,		Kempinski on 14 June, lot 29. Antiquorum's archive reaches back to 1974 and holds nothing
	~~returns nothing~~ else, and ~~no lot surfaced at~~ Phillips, Sotheby's, Christie's, Bonhams or		else under the reference, and neither Phillips, Sotheby's, Christie's, Bonhams nor Heritage has
	~~Heritage~~. The third is later and a great deal humbler: Arthur Johnson & Sons, a general		catalogued one. The third is later and a great deal humbler: Arthur Johnson & Sons, a general
	auctioneer in Nottingham, sold one as lot 7287 in a mixed Saturday sale on 14 March 2026,		auctioneer in Nottingham, sold one as lot 7287 in a mixed Saturday sale on 14 March 2026,
	catalogued in a single line as an Oyster Bubbleback, ref. 2240, with an automatic movement.		catalogued in a single line as an Oyster Bubbleback, ref. 2240, with an automatic movement.
Line 113:		Line 115:
	shell or two-tone, as it did across much of the contemporary range, is unknown.		shell or two-tone, as it did across much of the contemporary range, is unknown.

	There is a plausible reason the reference is so scarce in the record, ~~offered here as~~		There is a plausible reason the reference is so scarce in the record, though it is
	speculation ~~rather than fact~~. Both Antiquorum sales predate the internet-era auction archives		speculation. Both Antiquorum sales predate the internet-era auction archives
	that most collector research now runs on. The 2026 lot shows the other half of the problem: it		that most collector research now runs on. The 2026 lot shows the other half of the problem: it
	passed through a provincial general auctioneer, described in one line, indexed nowhere that		passed through a provincial general auctioneer, described in one line, indexed nowhere that
Line 140:		Line 142:
	520 and Cal. 620 that powered the earlier Bubblebacks, and it would be easy to reason from		520 and Cal. 620 that powered the earlier Bubblebacks, and it would be easy to reason from
	that to a specific sweep-seconds caliber. No documented source makes that attribution for the		that to a specific sweep-seconds caliber. No documented source makes that attribution for the
	# The ligne size, the jewel count, the escapement, the balance and the seconds layout are		2240. The ligne size, the jewel count, the escapement, the balance and the seconds layout are
	what the record supports.		what the record supports.

Line 175:		Line 177:
	the designation as Superlative Chronometer, Officially Certified, wording generally associated		the designation as Superlative Chronometer, Officially Certified, wording generally associated
	with a later period than the 1940s that the same lot assigns the watch. That could point to a		with a later period than the 1940s that the same lot assigns the watch. That could point to a
	later example, a replacement dial, or simply Antiquorum paraphrasing in the title. ~~The~~		later example, a replacement dial, or simply Antiquorum paraphrasing in the title. Without a
	chronology of Rolex's shift between the two chronometer designations ~~has not been checked~~		verified chronology for Rolex's shift between the two chronometer designations, the
	~~against independent sources here, so~~ nothing is ~~concluded from~~ it.		discrepancy is recorded and nothing is built on it.

	==Case, bezel, crystal, and crown==		==Case, bezel, crystal, and crown==
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	==Bracelets, end links, and clasps==		==Bracelets, end links, and clasps==

	Nothing is documented. ~~Neither lot~~ was sold on a Rolex bracelet, and no period fitment for the		Nothing is documented. None of the three was sold on a Rolex bracelet, and no period fitment
	reference appears anywhere in the ~~surfaced~~ record.		for the reference appears anywhere in the record.

	==Auction record==		==Auction record==