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== Automatic chronograph lineage ==
== Automatic chronograph lineage ==


Cal 4030 is the most contested specification in the Daytona literature. Rolex's first self-winding chronograph was based on the Zenith El Primero Class 400, restarted in 1986 after Charles Vermot hid the tooling through the quartz crisis, and Rolex modified it before the 16520 launched at Baselworld 1988. The exact list of changes does not agree across sources. Revolution's Ross Povey gives "in excess of 200 modifications" as a top-line figure with 52-hour power reserve, 31 jewels, and a free-sprung Breguet balance. Hodinkee's Paul Boutros enumerates a narrower list: a new escapement with larger free-sprung balance and Breguet overcoil, frequency reduced from 36,000 to 28,800 vph, the date function eliminated, with about 50% of El Primero parts retained. Hodinkee Part 2 cites a 54-hour power reserve when comparing cal 4030 to cal 4130's 72-hour figure. Both authorities agree the 28,800 vph frequency and free-sprung Breguet balance; both stay on record. The 4030 ran for twelve years and was the last foreign-sourced caliber in Rolex's modern collection.
Cal 4030 is the most disputed Daytona movement spec, but the working outline is clear. It is Rolex's heavily reworked Zenith El Primero base, launched in 1988 with the 16520 and used for twelve years. Serious sources agree on the important points: 28,800 vph, free-sprung Breguet balance, no date, and major Rolex reworking. They diverge on the size of the modification list and on power reserve, usually quoted as 52 or 54 hours. It was the last foreign-sourced caliber in Rolex's modern line.


Cal 4130 launched in the 116520 at Baselworld 2000 after five years of development. It was Rolex's first completely in-house chronograph movement. Vertical-clutch coupling replaces the lateral clutch on prior chronograph movements, with two consequences: no amplitude loss when the chronograph is engaged, and no backlash hop in the chrono seconds hand at start. The hour and minute counters integrate into one unit on a single side of the movement, freeing space for an enlarged mainspring barrel and a 72-hour power reserve. About 20% fewer parts than cal 4030 with 12 different screw types where the 4030 had 40-plus, the mainspring replaceable without uncasing the movement, and a serviceable vertical clutch where competitor brands' clutches are non-serviceable. The 4130 carried the entire pre-ceramic in-house Daytona generation (116520 / 116518 / 116519 / 116523 / 116528) through to the 2016 ceramic 116500LN, which sits outside this wiki's pre-2020 scope.
Cal 4130 launched in the 116520 at Baselworld 2000 after five years of development. It was Rolex's first completely in-house chronograph movement. Vertical-clutch coupling replaces the lateral clutch on prior chronograph movements, with two consequences: no amplitude loss when the chronograph is engaged, and no backlash hop in the chrono seconds hand at start. The hour and minute counters integrate into one unit on a single side of the movement, freeing space for an enlarged mainspring barrel and a 72-hour power reserve. About 20% fewer parts than cal 4030 with 12 different screw types where the 4030 had 40-plus, the mainspring replaceable without uncasing the movement, and a serviceable vertical clutch where competitor brands' clutches are non-serviceable. The 4130 carried the entire pre-ceramic in-house Daytona generation (116520 / 116518 / 116519 / 116523 / 116528) through to the 2016 ceramic 116500LN, which sits outside this wiki's pre-2020 scope.

Revision as of 04:13, 23 April 2026


Main Page -> Movements

Rolex movements

Every Rolex caliber that powered a pre-2020 Daytona, Submariner, GMT-Master, Explorer, or Oyster Perpetual reference is catalogued below: spec, production span, and reference fitments. The lineage threads four arcs. The manual-wind chronograph line ran from the Valjoux-72-derived cal 72 through cal 727 into 1988. The automatic chronograph started with the Zenith-derived cal 4030 and finished with the in-house cal 4130 in 2000. The sport time-only family travelled from the bumper-style A-series through the 1030 / 1530 platform and into the 30xx / 31xx series. The Oysterquartz sits outside that mechanical line entirely, from 1977. Lume material is per-dial and per-era rather than per-caliber and is not tracked here; see the per-reference dial map for that.

Caliber index

Caliber Type Base Years Jewels Frequency (vph) Power reserve (h) Hack Quickset GMT hand Chronometer Families Notes
72 chronograph Valjoux 72 1960–65 17 18,000 48 no – – no Daytona Bare Valjoux 72 in 6234 / early 6238
72A chronograph Valjoux 72 early-to-mid 1960s 17 18,000 48 no – – no Daytona Rolex-finished intermediate; thin documentation
72B chronograph Valjoux 72 1962–65 17 18,000 48 no – – no Daytona Final pre-722 Valjoux 72 in early 6238
722 chronograph Valjoux 72 1963–69 17 18,000 48 no – – no Daytona First Rolex-stamped Valjoux 72; 6239 / 6241
722-1 chronograph Valjoux 72 1969–70 17 18,000 48 no – – no Daytona Transitional 722 revision into the 727 era
727 chronograph Valjoux 72 1970–88 17 21,600 48 no – – no Daytona Higher-beat Valjoux 72; 6262 / 6263 / 6264 / 6265
4030 chronograph Zenith El Primero 400 1988–2000 31 28,800 54 no – – yes Daytona Modified El Primero in the Zenith Daytona; modification list disputed
4130 chronograph in-house 2000–present 44 28,800 72 no – – yes Daytona First in-house Rolex chronograph; vertical clutch
A260 automatic in-house 1953–55 17 18,000 36 no no – no Submariner, Oyster Perpetual First-generation Sub 6204 / 6205
A296 automatic in-house 1953–56 17 18,000 36 no no – no/yes Submariner, Explorer, Oyster Perpetual Big Crown 6200; Explorer 6098 / 6150 (non-COSC) / 6350 (COSC)
1030 automatic in-house 1955–62 25 18,000 42 no no – yes Submariner, Explorer, Oyster Perpetual Mid-1950s Sub 6536 / 6536-1 / 6538; Explorer 6610
1036 automatic in-house 1954–59 25 18,000 42 no no synchronized yes GMT-Master First GMT caliber; bakelite-bezel 6542
1065 automatic in-house 1956–59 25 18,000 42 no no synchronized yes GMT-Master Late-6542 GMT caliber
1530 automatic in-house 1957–65 26 18,000 42 no no – yes Submariner, Oyster Perpetual Foundation of the 15xx family; early 5512 / 5513
1520 automatic in-house 1965–90 26 18,000 42 no no – no Submariner Non-chronometer twin to 1570; late 5513 / 5514 / 5517
1560 automatic in-house 1959–65 26 18,000 42 no no – yes Submariner, GMT-Master, Explorer Cross-family chronometer; mid 5512 / 1675 / 1016
1565 automatic in-house 1959–65 25 18,000 42 no no synchronized yes GMT-Master Early 1675; "caller" GMT
1570 automatic in-house 1965–80 26 19,800 44 late only no – yes Submariner, Explorer Higher-beat 1560; hack added mid-life
1575 automatic in-house 1965–80 25 19,800 50 no no synchronized yes Submariner, GMT-Master, Explorer 1680 / late 1675 / Explorer II 1655
3000 automatic in-house 1989–99 27 28,800 48 yes no – yes Submariner, Explorer, Oyster Perpetual First 28,800 vph time-only; 14060 / 14270
3035 automatic in-house 1977–88 27 28,800 48 yes yes – yes Submariner First quickset Sub; 16800 / 168000 / 16808 / 16803
3075 automatic in-house 1979–88 27 28,800 48 yes yes synchronized yes GMT-Master 16750 / 16753 / 16758
3085 automatic in-house 1983–88 27 28,800 48 yes yes independent yes GMT-Master, Explorer First independent 24-hand; 16760 "Fat Lady" / 16550 Exp II
3130 automatic in-house 1999–2018 31 28,800 48 yes – – yes Submariner, Explorer, Oyster Perpetual Time-only successor to 3000; 14060M / 114060 / 114270
3132 automatic in-house 2010–~2020 31 28,800 48 yes – – yes Explorer, Oyster Perpetual 3130 with Parachrom + Paraflex; 214270
3135 automatic in-house 1988–2018 31 28,800 48 yes yes – yes Submariner 30-year workhorse; 16610 / 16613 / 16618 / 116610-series
3175 automatic in-house 1989–99 31 28,800 48 yes yes synchronized yes GMT-Master 16700 — last "caller" GMT
3185 automatic in-house 1989–~2007 31 28,800 48 yes yes independent yes GMT-Master, Explorer 16710 / 16713 / 16718 / 16570
3186 automatic in-house 2007–19 31 28,800 50 yes yes independent yes GMT-Master, Explorer Parachrom hairspring; 116710LN / BLNR / 116719BLRO / late 16710
5035 quartz in-house 1977–2001 11 32 kHz – yes yes – yes Oyster Perpetual Oysterquartz 17000 / 17013 / 17014
5055 quartz in-house 1977–2001 11 32 kHz – yes yes – yes Oyster Perpetual Oysterquartz Day-Date 19018 / 19028

Manual-wind chronograph lineage

The Daytona's first 25 years run on Valjoux 72 architecture. Cal 72 in the 6234 Pre-Daytona and earliest 6238 is a stock Valjoux ebauche; cal 72A and 72B are intermediate Rolex-finished revisions whose split is poorly documented in English-language editorial. Cal 722 is the first Rolex-stamped variant. It powers the original 6239 of 1963 and the screw-pusher 6240 / 6241 generation through 1969. US-bound 722 movements carry an engraved "ROW" import code on the balance bridge; a small Switzerland-retained remainder lacks the engraving. Cal 722-1 bridges late-6239 production into the 6262 / 6264 cal 727 era. The 722 → 727 cutover in 1970 is the most consequential Rolex change to the Valjoux 72 architecture: frequency goes from 18,000 to 21,600 vph (3 Hz). Cal 727 then runs the entire screw-pusher 6263 / 6265 production and the pump-pusher 6262 / 6264 transitional pair, ending the manual-wind era at 6263 / 6265 production close in 1988.

Automatic chronograph lineage

Cal 4030 is the most disputed Daytona movement spec, but the working outline is clear. It is Rolex's heavily reworked Zenith El Primero base, launched in 1988 with the 16520 and used for twelve years. Serious sources agree on the important points: 28,800 vph, free-sprung Breguet balance, no date, and major Rolex reworking. They diverge on the size of the modification list and on power reserve, usually quoted as 52 or 54 hours. It was the last foreign-sourced caliber in Rolex's modern line.

Cal 4130 launched in the 116520 at Baselworld 2000 after five years of development. It was Rolex's first completely in-house chronograph movement. Vertical-clutch coupling replaces the lateral clutch on prior chronograph movements, with two consequences: no amplitude loss when the chronograph is engaged, and no backlash hop in the chrono seconds hand at start. The hour and minute counters integrate into one unit on a single side of the movement, freeing space for an enlarged mainspring barrel and a 72-hour power reserve. About 20% fewer parts than cal 4030 with 12 different screw types where the 4030 had 40-plus, the mainspring replaceable without uncasing the movement, and a serviceable vertical clutch where competitor brands' clutches are non-serviceable. The 4130 carried the entire pre-ceramic in-house Daytona generation (116520 / 116518 / 116519 / 116523 / 116528) through to the 2016 ceramic 116500LN, which sits outside this wiki's pre-2020 scope.

Sport time-only lineage (Submariner, GMT-Master, Explorer)

The sport time-only line begins with the bumper-architecture A-series. Cal A260 powers the first-generation Submariner 6204 / 6205; cal A296 carries the Big Crown 6200 and the earliest Explorer references. The 6150-vs-6350 split on COSC certification of the same A296 is the cleanest documented spec divergence in this era: same caliber, two regulation grades. Cal 1030 then takes over from 1955, the slimmer architecture that supports the mid-1950s Big Crown / Small Crown Sub generation (6536 / 6536-1 / 6538) and the Explorer 6610. The 6536/1 introduces chronometer certification to the Submariner.

The 15xx family inherits the 1030's footprint and runs for three decades. Cal 1530 anchors the early 5508 / 5510 / 5512 / 5513 production; cal 1520 is the non-chronometer twin to cal 1570, used in late 5513, the COMEX 5514, and the MilSub 5517. Cal 1560 is the cross-family chronometer par excellence, sitting inside early 5512, mid-1675, and gilt-era 1016 simultaneously. Cal 1570 is the higher-beat 1560 (19,800 vph versus 18,000) with cleaner rotor finishing; Rolex retrofitted hack-second mid-production around 1972 without renaming the caliber, so 1570 examples come hack and no-hack. Cal 1575 is the same architecture with a date module and the synchronized 24-hour hand of the GMT calibers. It powers the date Submariner 1680, the late 1675 GMT-Master, and the Explorer II 1655 Freccione. The 1655 is the unusual case: a "GMT" caliber in an Explorer-line watch, with the GMT hand reading a fixed 24-hour bezel rather than tracking a second timezone.

The GMT branch is easiest read in three steps. Cal 1036 and 1065 belong to the bakelite 6542 era and keep the 24-hour hand linked to the main hour hand. Cal 1565, 1575, and 3075 carry that synchronized style through the 1675 and 16750 generation. Cal 3085 is the break: the first independently jumping local hour hand, used in the 16760 and 16550. Cal 3185 then defines the long 16710 run, and cal 3186 adds Parachrom for late 16710 and the ceramic-era GMT line. The 16700 keeps the old synchronized caller layout alive on cal 3175 until 1999.

The modern time-only line settles on the 31xx series. Cal 3000 is the first 28,800 vph time-only caliber, hacking standard, no quickset, used in the no-date 14060 Sub and the first sapphire 14270 Explorer. Cal 3130 is its time-only successor with bridge revisions and a Glucydur balance, powering 14060M, 114060, 114270, and the modern Oyster Perpetual line. Cal 3132 adds Parachrom and Paraflex for the 39 mm 214270. Cal 3135 is the date variant of the 3130 platform, the most-produced Rolex caliber of the modern era. Its 30-year run from the 1988 16610 introduction to the Cerachrom 116610 series in 2020 covers virtually every steel-bracelet Submariner Date a contemporary collector buys today, and the same architecture lives in Datejust and Sea-Dweller generations of the same era.

Oyster Perpetual lineage

The Oyster Perpetual line shares the sport calibers through most of its history. The Bubbleback / early Oyster era runs on a series of in-house automatic calibers (520, 620, 630, and the A-series) that pre-date the unified caliber numbering used here. Those movements are documented per reference on the Bubbleback family page rather than abstracted into the cross-family registry. Mid-century OP shares the A296 and 1030 with the Submariner and Explorer references of the same vintage. The classic 4-digit no-date OP cluster (1002 / 1003 / 1018 / 1024 / 1025) carries cal 1530 / 1560 / 1570 in chronometer or non-chronometer specification depending on the variant. The 5-digit OP (14000 / 14010 / 14200 / 14203) and 6-digit modern OP (114200 / 114210 / 114300) sit on cal 3000 then cal 3130 / 3132, the same calibers shared with no-date Submariner and Explorer of the same era.

The Oysterquartz outlier sits outside the mechanical lineage. Cal 5035 (Datejust / Oyster Perpetual application) and cal 5055 (Day-Date application) launched in 1977 as Rolex's first completely in-house quartz calibers, with a 32 kHz oscillator, CMOS coupling, analog thermocompensation, 11 jewels, and chronometer certification. Production ran through 2001 with the steel 17000 the final Oysterquartz model. Total Oysterquartz output is small for a Rolex line, under 25,000 units across the entire run. The 5035 powers the 17000 (steel), 17013 (two-tone), and 17014 (white-gold bezel); the 5055 powers the 19018 / 19028 Day-Date Oysterquartz.

Sources

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