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Rolex Oyster & Bubbleback

The Bubbleback is Rolex's early Oyster Perpetual family. The automatic rotor was too thick for a flat case, so Rolex domed the caseback over the movement and created the profile collectors now call Bubbleback. Production examples run from 1933 into the mid-1950s; later Cal. 1030 references could use a flatter caseback, so the line gradually moved away from the domed profile. Italian collectors call the standard 32mm case Ovetto and the 36mm cases Ovettone.

Common entry points

Identifying a first-generation Bubbleback?

1858

The first Bubbleback. Cal 520 with the full 360-degree rotor, the Didactic engravings in French on the movement plate, and the four-piece case form.

Cross-checking a two-piece case Bubbleback?

3131

First two-piece case Bubbleback. The 1936 case simplification, precious-metal only (9K, 14K, 18K yellow and pink gold), Cal 620 with sub-seconds.

Working from a Luxury Model dial photo?

3372

The "Luxury Model" name appears in period advertising; documented examples and manual entries show several bezel and seconds configurations.

Pre-Oyster / Submarine (1922–1926)

Before the Oyster was the "Rolex Submarine." Wilsdorf's trademark was registered 31 March 1922, 31 years before the 1953 dive watch. Based on Jean Finger's 1921 Swiss patent for a double-case hermetic design, the inner watch sealed inside an outer protective case with a screw-down bezel. Winding or setting the watch required unscrewing the outer case.

Reference	Production	Movement	Case	Key distinction
3666	1924 and circa-1925 examples; span unknown	manual, 15 jewels in catalogues; caliber unconfirmed	32–33mm silver hinged-case Hermetique	W&D is a sponsor mark, not proof of case maker; a separate 1940 chronograph was also catalogued as 3666

Pre-Perpetual Oyster (1926–1932)

Before the Bubbleback, Rolex produced manual-wind Oysters in the 1926 case form. Most carried 10½-ligne or 9¾-ligne Aegler Hunter movements at Prima, Extra Prima, or Ultra Prima grades. Glasgow import hallmarks are common on British-market examples. The movement architecture is traditional manual wind; the case is already recognizably Oyster.

Reference	Production	Movement	Case	Key distinction
1069	Antiquorum dates lots to 1920s; Christie's circa 1930; span unproved	Manual; 11-ligne/15j movement reported once; other descriptions differ	Cushion; catalogued 30–32mm, steel and silver-plated examples	Solar Aqua/Anti-Magnetic dial; caseback 21836 has a conflicting 1940s seller date
1072	Auctions date examples to the 1930s, circa 1938, and 1940s; one dealer assigns circa 1927, span unresolved	10-ligne/18j and 15-jewel Prima descriptions; caliber unconfirmed	Cushion, 31–34mm; stainless-steel and chrome descriptions	Silvered Arabic, gilt-baton, two-tone 24-hour, and one Bucherer-signed dealer dial record
1073	Antiquorum circa 1926; Christie's circa 1930; Bonhams 1930s; dealer 1934; production span unproved	Antiquorum: 10½-ligne Extra Prima, 15j; other auction lots name Prima grades	Cushion, 31–32mm; stainless-steel and chrome descriptions	Enamel Breguet, silvered Arabic, Roman, and one dealer-described California dial	2136	c.1926–1940	10½′′′ Hunter, 15j manual	32–34mm octagonal / cushion	Early manual-wind gold Oyster; Borgel-lineage three-piece construction; same reference reused c.1960 for a Cal. 1400 Precision
3003 · 3004	1937 launch	Manual lever movements; two auction lots describe 10-line, 15- and 17-jewel examples	One catalogued 3003 is 27mm steel/pink gold; one 3004 is 30mm steel	First pair listed under Oyster Precision; documented examples differ in case and seconds layout
1873	Most auction dates c.1930–1940; Cambi lists c.1954	Manual; 15–18j; Extra Prima and Ultra Prima grades	31–32mm; seven steel entries, one 9K gold; tonneau-form cases catalogued	Eight auction entries; one flat-back title; Cambi describes central seconds

Other manual-wind Oyster references

Manual-wind Oyster references ran alongside the automatic Bubbleback. Auction records describe tonneau or cushion cases and manual movements; the automatic Bubbleback line used rotor movements.

Reference	Production	Movement	Case	Key distinction
3139	c.1940–1942	10½′′′ Hunter, manual	32mm cushion Oyster, 3-piece	Only Rolex with "Army" on the dial; cushion case in the Borgel-derived 1920s family; documented British military and civilian examples
3359	c.1939–1947	10½′′′ Hunter, manual	32mm tonneau Oyster, two-tone SS + pink gold	Viceroy-signed dial; two-tone SS case with pink gold bezel; applied luminous numerals
3358	auction examples dated c.1940 and 1942; range unproved	Cal. 700 directly named on one lot; manual movement on another	Steel three-body Oyster with pink-gold bezel; catalogued diameters 28, 29 and 30mm	Separate Viceroy and Oyster Chronomètre dial descriptions; not an automatic Bubbleback
2765	c.1939–1942 catalogue dates; range unproved	10–10½-ligne manual, 17–18j; caliber unresolved	31–32mm steel tonneau Oyster; screw-down back and crown	Misclassified as a Bubbleback on collector lists; ten auction appearances represent eight watches
2784	individual catalogue estimates c.1930–1945; range unproved	Manual, 15–17j; FHF 30 / Cal. 59 family attribution unconfirmed on an original photographed movement	Usually 30–31mm barrel Oyster; steel and steel/gold documented	Junior Sport, Lipton, Viceroy, Raleigh, Centregraph and photographed Solar Aqua names
3009	range unproved; Glasgow import mark 1937 and presentation inscription 1947	Mostly catalogued manual, 17–18j; Cal. 700 family attribution probable; two repeated LSK automatic descriptions unresolved	30–33mm precious-metal tonneau Oyster	White enamel Scientific dial plus Observatory, 24-hour, California and silvered layouts
4220	c.1944–1948	Cal. 59 manual, 17j	30mm tonneau Oyster SS	Speedking line; California dial; a documented 1940s small-Oyster manual-wind configuration

First Bubbleback (1933–1935)

The first production Perpetual. Cal. 520 (Hunter 8¾′′′) with a full 360-degree rotor. Early examples carry the Didactic engravings: step-by-step service instructions in French cut directly into the movement plate.

Reference	Production	Movement	Case	Key distinction
1858	1933–1935	Cal. 520, 17j	32mm tonneau, 3/4-piece	First Bubbleback; Didactic movement; 60% Didactic split across 5 confirmed auction lots

Two-piece case era (1936–1944)

Rolex introduced a two-piece Bubbleback case with refs. 3131 and 3132 in 1936. Other references still appear in catalogues as three-body cases, including the 3134. Cal. 620 (subsidiary seconds) and Cal. 630 (sweep seconds) became the dominant automatic calibers, developed by Emile Borer at Aegler.

Reference	Production	Movement	Case	Key distinction
2240	1930s–1940s catalogue dates; range unproved	9¾-ligne automatic, 19j, centre seconds; caliber unresolved	32mm steel tonneau; back profile unshown on specialist-catalogued examples	Bubbleback classification probable; a separately attributed watch has a domed back but no published reference engraving
3131	1936–1948	Cal. 620, 17j, sub-seconds	32mm tonneau, 2-piece	First two-piece case Bubbleback; precious-metal only (9K/14K/18K YG & PG)
3134	1940s–1957 catalogue dates	9¾-ligne automatic; caliber unresolved; subsidiary and centre seconds documented	32mm tonneau, catalogued as three-body	Steel and steel/yellow gold documented; California-dial originality unconfirmed
3135	1938–c.1945 catalogue dates	9¾-ligne automatic family; caliber unresolved; subsidiary and centre seconds documented	32–33mm steel tonneau; one example catalogued as two-body	Sector, Roman, radium, pink and 24-hour dials documented; manual-wind listing is a probable 3135/3136 catalogue error
3599	1939–1946 catalogue dates	Early Perpetual family; Cal. 635 documented with subsidiary seconds	31–34mm catalogued, fitted hood covers	Mainly steel; wide flat bezel; fluted and smooth hoods; centre-seconds auction examples have unresolved caliber and factory status
3372	auction estimates c.1938–c.1959; factory range unconfirmed	Cal. 630 listed by Field Manual and named in one lot; other catalogues give 9¾-ligne / N 1411; centre and subsidiary seconds recorded	tonneau case; 32–33mm in cited lots; case and bezel variants	"Luxury Model" name reported in period advertising; 3372/0 listed with smooth polished bezel; dials need lot-specific originality checks

Early two-pusher Oyster chronograph (1939–mid-1940s)

The 3525 is commonly described as the first two-pusher chronograph in Rolex’s Oyster case; earlier Oyster-cased monopusher chronographs existed. Its one-piece upper case gave rise to the collector term Monoblocco. Some surviving examples have documented wartime orders and deferred payment, including those catalogued for Clive Nutting and Leon Brownlee.

Reference	Production	Movement	Case	Key distinction
3525	catalogue examples c.1940–1945; factory span unconfirmed	Cal. 13 / Valjoux 23 family, manual chronograph	~35mm monobloc Oyster SS/gold	Commonly described as an early two-pusher Oyster chronograph; earlier Oyster monopushers existed. Nutting example offered in 2007 with CHF 130,000–160,000 estimate; result not shown

First Datejust / Ovettone (1945–1949)

The 4467 launched in 1945 to mark Rolex's 40th anniversary. The 4467 article covers the early Datejust, its 36mm case, Jubilee bracelet and documented examples.

Reference	Production	Movement	Case	Key distinction
4467	1945–1949	Cal. A.295 (= 740/745), 18j	36mm 18K YG/PG tonneau, 2-piece	Early Datejust; early Jubilee and solid end-link configuration; Ovettone; date wheel evolves all-black → all-red → roulette
5030	circa 1948	Cal. A.295 / 740 (see reference-specific sources)	36mm; solid gold examples	Early date-equipped Oyster Perpetual; paired with the 5031 in some collector usage
5031	auction dates range from circa 1948 to the 1960s	Automatic in sale catalogues; caliber unresolved	34–36mm in catalogues; steel and pink or yellow gold described	Date at 3; movement and case details vary by example
6031	auction dates include circa 1949–1950 and the 1950s	Automatic in catalogues; caliber unresolved	35–36mm; 18K yellow and pink gold catalogued	Date-equipped Oyster Perpetual; left-hand examples catalogued with crown at 9
6075	Auction dates include 1950–51; one c.1961 estimate conflicts	A.295 and A.296 attributed in separate catalogues	35–36mm; 18K YG/PG and steel + YG; one 10K YG catalogue description	Gold, pink-gold and two-tone cases; one photographed Datejust dial is graded restored
6105	Early 1950s; catalogue dates vary	A.296 and 745-attributed examples	36mm; gold and two-tone examples	Early dial-signed Datejust; often credited as first, but factory first use is not settled by the 6075 restored dial

Triple calendar: Padellone (1949–1953)

"Padellone" means "big pan" in Italian, an augmentative of padella ("pan") that follows the same naming logic as Ovetto/Ovettone. Triple calendar (day, month, date) plus moonphase. The Padellone uses a snap caseback rather than the screw-down construction of an Oyster case.

Reference	Production	Movement	Case	Key distinction
8171	c.1949–1953	Cal. A.295 CPL automatic triple calendar moonphase, in-house Aegler	38mm non-Oyster snap caseback, 18K YG/PG, SS rare	Triple calendar + moonphase; Padellone; published examples include stainless steel and gold cases

Post-Bubbleback / Super Oyster (1952–1953)

Cal. 1030, the first Rolex-designed-from-scratch caliber and a bi-directional automatic, made the flat caseback possible and ended the Bubbleback profile. The 6098 "Super Oyster" carried 60m water resistance into the Oyster Perpetual line, preceding the Submariner by a year and preceding the Explorer and Submariner launches of 1953 and the GMT-Master launch of 1955.

Reference	Production	Movement	Case	Key distinction
6098	1952–1953	Cal. 1030 (or A.296), 25j, bi-directional	36mm Oyster, flat caseback	"Super Oyster" per 1953 Vailati letter; 60m water resistance; pre-Explorer / pre-Submariner ancestor; honeycomb and galaxy dials

Related references

The Bubbleback era connects forward to:

6098 (Super Oyster, 60m water resistance in 1952; pre-Explorer and pre-Submariner ancestor)
6150 (first Explorer, 1952)
6204 (first Submariner, 1953)
6305 (first Datejust with Cyclops, 1954)
6604 and 6605 (first Datejust with instantaneous date change, Cal. 1065, 1956–57)

Related families

Air-King — the descendant line. The 1945 4925 / 4365 / 4499 originating Air-Kings sit in the same Bubbleback case architecture and run on the same Aegler hand-wound calibers.
Prince — the parallel 1930s line. The Aegler-supplier relationship that powers the Prince also powers every Bubbleback caliber.
Daytona — the chronograph ancestor. The pre-Daytona Antimagnetique, Monoblocco, and 4xxx tonneau Oyster chronographs share the same era and case lineage.

Shared references

Serial numbers by year — early serial ranges and hallmark dating
Movement reference — the calibers used across the Bubbleback line
Bracelet & clasp guide — bracelet types, end-links, and clasp date codes

Sources

Primary and specialist

Editorial and market

@@ Line 48: / Line 48: @@
 ! Reference !! Production !! Movement !! Case !! Key distinction
 |-
+|-
 | [[Reference:1069|1069]] || Antiquorum dates lots to 1920s; Christie's circa 1930; span unproved || Manual; 11-ligne/15j movement reported once; other descriptions differ || Cushion; catalogued 30–32mm, steel and silver-plated examples || Solar Aqua/Anti-Magnetic dial; caseback 21836 has a conflicting 1940s seller date
+|-
+| [[Reference:1072|1072]] || Auctions date examples to the 1930s, circa 1938, and 1940s; one dealer assigns circa 1927, span unresolved || 10-ligne/18j and 15-jewel Prima descriptions; caliber unconfirmed || Cushion, 31–34mm; stainless-steel and chrome descriptions || Silvered Arabic, gilt-baton, two-tone 24-hour, and one Bucherer-signed dealer dial record
+|-
+| [[Reference:1073|1073]] || Antiquorum circa 1926; Christie's circa 1930; Bonhams 1930s; dealer 1934; production span unproved || Antiquorum: 10½-ligne Extra Prima, 15j; other auction lots name Prima grades || Cushion, 31–32mm; stainless-steel and chrome descriptions || Enamel Breguet, silvered Arabic, Roman, and one dealer-described California dial
 | [[Reference:2136|2136]] || c.1926–1940 || 10½′′′ Hunter, 15j manual || 32–34mm octagonal / cushion || Early manual-wind gold Oyster; Borgel-lineage three-piece construction; same reference reused c.1960 for a Cal. 1400 Precision
 |-