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Zenith El Primero

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Zenith El Primero Chronomaster Steel 38mm Transparent UAE, 213858
Zenith El Primero Chronomaster
Full Open Skeleton Dial
AED35,000
Free shipping
Zenith El Primero Chronomaster Platinum 42mm Grey UAE, Dubai
Zenith El Primero Chronomaster
Platinum Chronomaster Power Reserve
AED73,463
Free shipping
Zenith El Primero Chronomaster Steel 42mm Blue No numerals UAE, Dubai
Zenith El Primero Chronomaster
Open
AED21,750
+ AED55 for shipping
Zenith El Primero Chronomaster Steel 40mm Black UAE, Dubai
Zenith El Primero Chronomaster
01.240.410
AED18,934
+ AED110 for shipping
Zenith El Primero Chronomaster Steel 37mm White UAE, 74429
Zenith El Primero Chronomaster
03.L384-2.400/07.M384
AED27,000
Excl. shipping
Private Seller
Zenith Chronomaster Sport Steel 41mm Black No numerals UAE, Dubai
Zenith Chronomaster Sport
Black Dial New In Stickers - Extra original strap and buckle - Full
AED32,000
+ AED76 for shipping
Zenith Chronomaster Sport Steel Black No numerals UAE, Dubai
Zenith Chronomaster Sport
Unworn with black manufacturer rubber strap AND manufacturer steel bracelet.
AED40,000
Excl. shipping
Private Seller
Zenith El Primero Tourbillon Steel Black UAE, Dubai
Zenith El Primero Tourbillon
03.2280.4035/21.C714
AED76,500
Free shipping
Zenith El Primero Chronomaster Steel 37mm White No numerals UAE, Dubai
Zenith El Primero Chronomaster
Revival El Primero A3817
AED28,080
Free shipping
Zenith El Primero Chronomaster Lady Steel 37.5mm White Arabic numerals UAE, Abu Dhabi
Zenith El Primero Chronomaster Lady
Star Open Heart Love
AED15,469
Free shipping
Zenith El Primero Chronomaster Rose gold 42mm Silver UAE, Dubai
Zenith El Primero Chronomaster
Power Reserve
AED45,441
Free shipping
Zenith El Primero Chronomaster Ceramic 45mm Black No numerals
Zenith El Primero Chronomaster
Bullit
AED20,827
+ AED568 for shipping
Zenith El Primero Espada Rose gold 40mm Brown UAE, Dubai
Zenith El Primero Espada
22.2170.4650/76.C713
AED40,897
+ AED110 for shipping
Zenith Chronomaster Sport Steel 41mm White No numerals
Zenith Chronomaster Sport
2022 Unworn Chronograph 03.3100.3600/69.M3100
AED36,877
+ AED923 for shipping
Zenith El Primero Chronograph Yellow gold Black Roman numerals
Zenith El Primero Chronograph
SERVICE 2022 Black Dial 30.0500.400 18K Gold
AED26,129
+ AED375 for shipping
Zenith Chronomaster Sport Steel 41mm White No numerals
Zenith Chronomaster Sport
03.3100.3600/69.M3100
AED40,140
+ AED1,136 for shipping
Zenith El Primero Tourbillon Rose gold White UAE, Dubai
Zenith El Primero Tourbillon
18.2280.4035/01.C713
AED100,000
Free shipping
Zenith Chronomaster Sport Steel 41mm Black No numerals UAE, Dubai
Zenith Chronomaster Sport
El Primero Sport Black Dial 41mm Steel
AED33,333
Free shipping
Zenith El Primero Chronomaster Ceramic 45mm Black UAE, Abu Dhabi
Zenith El Primero Chronomaster
Night Vision 2018 Ceramic
AED26,299
Free shipping
Zenith El Primero Steel 38mm Silver (solid) No numerals
Zenith El Primero
36.00VpH 38 mm full Set 03.2022 new
AED27,131
+ AED735 for shipping
Zenith El Primero Chronomaster Steel White
Zenith El Primero Chronomaster
Open 1969 Watch
AED22,993
+ AED251 for shipping
Zenith El Primero Winsor Annual Calendar Rose gold 42mm UAE, Dubai
Zenith El Primero Winsor Annual Calendar
Captain Winsor Annual Calendar
Price on request
+ AED110 for shipping
Zenith El Primero Chronomaster Aluminum 42mm Silver No numerals
Zenith El Primero Chronomaster
24.2041.400/01.R576
AED21,410
+ AED738 for shipping
Zenith El Primero Gold/Steel 40mm White
Zenith El Primero
Rainbow
AED14,728
+ AED550 for shipping
Zenith El Primero Chronomaster Steel 37mm White No numerals
Zenith El Primero Chronomaster
A384 Revival - 03.A384.400/21.C815
AED25,097
+ AED365 for shipping
Zenith El Primero Chronomaster Rose gold 42mm Silver UAE, Dubai
Zenith El Primero Chronomaster
Power Reserve
AED45,000
Free shipping
Zenith El Primero Steel 43mm Silver Roman numerals
Zenith El Primero
Chronomaster Flyback Chronograph B&P
AED31,746
Free shipping
Zenith El Primero Chronomaster Steel 37mm Brown No numerals
Zenith El Primero Chronomaster
Revival El Primero A385
AED23,994
+ AED329 for shipping
Zenith Chronomaster Sport Steel 41mm Black No numerals
Zenith Chronomaster Sport
03.3100.3600/21.M3100
AED36,914
+ AED329 for shipping
Zenith Chronomaster Sport Steel 41mm Black No numerals
Zenith Chronomaster Sport
03/2021 perfect condition box papers
AED35,433
+ AED735 for shipping

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Zenith El Primero Tourbillon Rose gold 45mm Transparent No numerals
Zenith El Primero Tourbillon
Chronomaster GFJ Tourbillon Rose Gold 45mm - Limited Edition of 50 Pieces Only
AED160,430
+ AED129 for shipping
Zenith El Primero Chronomaster Steel 40mm Silver Roman numerals
Zenith El Primero Chronomaster
Calendar Moonphase full set
AED20,302
+ AED554 for shipping
Zenith El Primero 410 Steel 42mm Blue
Zenith El Primero 410
Chronograph 42 Calendar Moonphase 1975 Limited edition - Full set Near mint
AED29,527
+ AED159 for shipping
Zenith El Primero Chronomaster Steel 37mm Brown No numerals
Zenith El Primero Chronomaster
Revival El Primero A385 - 03.A384.400/385.M385
AED26,574
+ AED365 for shipping
Zenith El Primero Chronomaster Rose gold 45mm Silver UAE, Dubai
Zenith El Primero Chronomaster
Grande Date
AED57,500
Free shipping
Zenith El Primero Chronomaster Lady Steel 38mm Mother of pearl No numerals
Zenith El Primero Chronomaster Lady
Open Heart Unworn B&P
AED27,648
Free shipping
Zenith El Primero Chronomaster Steel 45mm Black Roman numerals
Zenith El Primero Chronomaster
Open Xxt 03.1260.4021/21.M1260 EL PRIMERO
AED23,478
+ AED473 for shipping
Zenith Chronomaster Sport Steel 41mm Black No numerals
Zenith Chronomaster Sport
03.3100.3600/21.M3100
AED40,420
+ AED329 for shipping
Zenith Chronomaster Sport Steel 41mm Black No numerals
Zenith Chronomaster Sport
Fullset new 03/2022
AED35,622
+ AED443 for shipping
Zenith El Primero Chronomaster Steel 42mm Black No numerals
Zenith El Primero Chronomaster
Open Power-Reserve 42mm 03.2080.4021/21.C496 - Discontinued
AED16,478
+ AED129 for shipping
Zenith El Primero Chronomaster Steel 37mm Silver No numerals
Zenith El Primero Chronomaster
A384 Revival Chronomaster
AED32,484
+ AED369 for shipping
Zenith El Primero Tourbillon White gold 44mm UAE, Dubai
Zenith El Primero Tourbillon
65.2051.4035/69.C713
AED94,000
Free shipping
Zenith Chronomaster Sport Steel 41mm Black No numerals
Zenith Chronomaster Sport
03.3100.3600/21.M3100 - BLACK DIAL
AED40,601
+ AED365 for shipping
Zenith El Primero 36'000 VpH Steel 42mm Grey No numerals
Zenith El Primero 36'000 VpH
Chronograph Classic Cars Limited edition - 36000 VpH Very fresh
AED23,990
+ AED159 for shipping
Zenith El Primero Chronomaster Gold/Steel 38mm UAE, Dubai
Zenith El Primero Chronomaster
38mm El Primero Skeleton
AED24,425
+ AED57 for shipping
Zenith Chronomaster Sport Rose gold 41mm
Zenith Chronomaster Sport
El Primero Chronomaster Sport RG
AED66,269
+ AED375 for shipping
Zenith El Primero Chronomaster Steel 42mm Silver No numerals
Zenith El Primero Chronomaster
03.2040.4061/69.C496
AED31,007
+ AED329 for shipping
Zenith El Primero Original 1969 Steel 38mm Silver No numerals
Zenith El Primero Original 1969
Pre-Owned Zenith Chronomaster El Primero 03.2150.400/69.C713
AED26,318
Free shipping
Zenith El Primero Chronomaster Steel 42mm Silver No numerals
Zenith El Primero Chronomaster
Open Power-Reserve 42mm 03.2080.4021/01.C494 - Discontinued
AED18,192
+ AED129 for shipping
Zenith El Primero Chronomaster Steel 37mm White No numerals
Zenith El Primero Chronomaster
A384 Revival Chronomaster
AED27,685
+ AED664 for shipping
Zenith El Primero Chronomaster Rose gold 45mm Silver UAE, Dubai
Zenith El Primero Chronomaster
18.2160.4047/01.C713
AED55,000
Free shipping
Zenith El Primero Chronomaster Titanium 42mm Transparent No numerals
Zenith El Primero Chronomaster
2 - 95.3002.3600/69.C818 - LIMITED EDITION
AED34,695
+ AED365 for shipping
Zenith El Primero Chronograph White gold 44mm Silver Arabic numerals
Zenith El Primero Chronograph
Grande Class White Gold Limited edition of 500 - Full set Serviced
AED34,695
+ AED159 for shipping
Zenith El Primero Steel 37mm Grey
Zenith El Primero
VINTAGE EL PRIMERO CON ESTRATTO 37MM IN ACCIAIO REF. A385
AED51,125
+ AED3,691 for shipping
Zenith El Primero Steel 37mm
Zenith El Primero
Cover Girl A3818 Revival LIMITED
AED45,063
+ AED375 for shipping
Zenith El Primero Titanium 44mm Transparent
Zenith El Primero
Skeleton cut/Rubber Ø44 mm
AED29,387
+ AED181 for shipping
Zenith El Primero Chronomaster Steel 45mm Black No numerals
Zenith El Primero Chronomaster
Grande Date
AED32,853
+ AED1,292 for shipping
Zenith El Primero 36'000 VpH Steel 42mm Black Arabic numerals
Zenith El Primero 36'000 VpH
Chronograph LIMITED EDITION RED 36.000 VPH - Stainless Steel - With Box And Papers 03.2043.400/25.C703 2014
AED23,994
+ AED369 for shipping
Zenith El Primero 36'000 VpH Steel 42mm
Zenith El Primero 36'000 VpH
Chronograph 2016 Box and Papers
AED18,666
+ AED251 for shipping
Zenith El Primero Tourbillon Steel 44mm Black UAE, Dubai
Zenith El Primero Tourbillon
03.2050.4035/21.C630
AED70,000
Free shipping

Zenith El Primero: The First Movement of Its Kind

The Zenith El Primero was the first automatic chronograph caliber in the world. Oscillating at a high frequency, this movement can measure 1/10th of a second. Current top models can even time to 1/100th of a second and boast a double tourbillon.

By Chrono24

High Performance and Precision Since 1969

The Swiss luxury watch manufacturer Zenith is inseparable from their famous chronograph caliber, the El Primero, which means "the first" in Spanish. The movement was released in 1969 and is considered the first automatic chronograph movement ever produced. The El Primero earned the brand with the star logo its place in horological history and has since become Zenith's showpiece.

Thanks to an unusually high balance frequency of 36,000 vph (5 Hz), the movement can measure 1/10th of a second – a feat that remains a rarity in mechanical chronographs to this day. Despite its frequency, the caliber has a power reserve of 50 hours when fully wound. In comparison, the Valjoux 7750 from ETA only has a power reserve of around 44 hours.

Today, the El Primero powers various watches in the {model-189,Chronomaster}, Defy, and Pilot series. The El Primero 21, introduced in 2017 and found in some watches in the Defy line, increases the movement's already legendary precision by a factor of ten. It is fitted with two oscillation/escapement systems – one for the time display, which runs at 5 Hz, and another for the chronograph. The latter boasts an incredible frequency of 50 Hz, which allows timing to 1/100th of a second.

Other highlights include El Primero movements with a double tourbillon or fusee. The double tourbillon version relies on a tourbillon each for the time display and chronograph function, while the El Primero Fusee with a tourbillon uses a fusee and chain mechanism to modulate the force of the mainspring. Zenith's watchmaking brilliance extends to movements with so-called Gravity Control. Here, the balance and escapement are part of a gyroscopic regulating module that continuously realigns itself to counteract the effects of gravity.

Reasons to Buy a Watch With an El Primero Movement

  • High balance frequency enabling measurements to 1/10th of a second
  • El Primero 21 with two escapements, measures 1/100th of a second
  • 50-hour power reserve
  • Top models with a tourbillon or Gravity Control
  • World's first automatic chronograph caliber

Prices for Watches With El Primero Calibers

Model/Reference number Price (approx.) Material, Movement
Defy Double Tourbillon / 40.9000.9020/78.R582 106,000 USD Platinum, EP 9020
Defy Zero G / 18.9000.8812/79.M9000 93,500 USD Rose gold, EP 8812 S
Academy Christophe Colomb Equation of Time / 18.2220.8808/01.C631 68,500 USD Rose gold, EP 8808
Defy Fusee Tourbillon / 10.9000.4805/78.R916 61,000 USD Carbon, EP 4805
Chronomaster Tourbillon / 65.2050.4035/91.C714 50,000 USD White gold, EP 4035
Chronomaster / A386 19,000 USD Stainless steel, EP 400
Defy Extreme / 87.9100.9004/03.I001 18,500 USD Microblasted titanium and rose gold, EP 9004
Chronomaster Sport / 03.3100.3600/69.M3100 10,500 USD Stainless steel, EP 3600
Chronomaster Original / 03.3200.3600/69.C902 8,300 USD Stainless steel, EP 3600
Pilot Type 20 Chronograph / 03.2434.4069/20.I010 6,600 USD Stainless steel, EP 4069
Chronomaster Revival El Primero A384 / 03.A384.400/21.C815 6,400 USD Stainless steel, EP 400
Chronomaster El Primero TV / 01-0200-415 4,700 USD Stainless steel, EP 3019PHC
Prime / 01-0010.420 2,600 USD Stainless steel, EP 420 (manual)

How much does a Zenith El Primero cost?

Zenith chronographs outfitted with an El Primero caliber are available starting at 2,500 USD on Chrono24. For this price, you can find well-maintained models from the 1990s and early 2000s. Prices for watches from current collections, such as the Chronomaster Open with a partially skeletonized dial, start closer to 7,000 USD. Expect to see prices around 8,200 USD for a Chronomaster Original with the classic tricolor dial. Set aside at least 2,000 USD more if you want to purchase a model with the state-of-the-art El Primero 21 caliber.

You'll find watches with a double tourbillon, Gravity Control, or fusee at the upper end of the price range. These watches demand between 60,500 USD and 105,000 USD.

Vintage refs like the A384 and A386 are particularly popular with collectors, and will set you back between 14,000 USD and 19,000 USD, depending on the exact model and condition. Watches powered by the El Primero but not made by Zenith are also coveted among collectors. Some popular examples include the Rolex Daytona ref. 16520 and TAG Heuer Carrera Calibre 36. The latter is available on Chrono24 starting around 4,600 USD, while the Rolex demands closer to 38,000 USD.


Vintage El Primeros

The first Zenith timepieces to feature the then-groundbreaking El Primero caliber were the references A384, A385, and A386. The A386 is considered by many to be the archetypal Zenith chronograph thanks to its iconic dial design with three subdials, each in a different color. The 30-minute counter at 3 o'clock is blue, the 12-hour counter at 6 is dark gray, and the small seconds at 9 has a light gray hue. A red chronograph hand adds the perfect amount of color to the dial, and the round, 38-mm stainless steel case gives the watch a classic overall look. Well-maintained examples of this watch can be purchased on Chrono24 starting at 19,000 USD.

The A384 and its sibling, the A385, look markedly different than the A386. Both have a tonneau-shaped case with accentuated edges. The dial of the A384 is a typical panda layout, i.e., white background with black subdials. The dial of the A385, on the other hand, features a radial color gradient ranging from light beige to brown with contrasting white subdials. An A384 in good condition costs around 14,500 USD. The A385 almost seems like a bargain in comparison at just under 8,800 USD.


Revival and Retro Models

For a number of years now, Zenith has offered a range of retro and revival models that hark back to the designs of the very first El Primero watches. For example, fans of the A386 should check out watches in the Chronomaster Original collection. The ref. 03.3200.3600 is a fan favorite because it shares so many characteristics with the original, including a 38-mm case and tricolor subdial design. Inside this case, however, you'll find the caliber EP 3600, a modernized version of the El Primero offering an updated 60-hour power reserve and a stop-seconds mechanism. It is easy to identify watches with this movement by the subdials at 3 and 6 o'clock, which are now 60-second and 60-minute counters, respectively. Moreover, a scale to measure tenths of seconds replaces the tachymeter scale on the rehaut.

A stainless steel Chronomaster Original costs around 8,300 USD on Chrono24. If you'd prefer a rose gold model, expect prices closer to 18,000 USD.

If you'd like a watch that comes as close to the first El Primero watches as possible, the Chronomaster Revival collection is worth a closer look. The Chronomaster Revival El Primero A384 ref. 03.A384.400/21, for instance, is a near replica of the 1969 model. Even the El Primero 400 caliber powering the modern watch closely resembles the original. You can buy this timepiece on a leather strap for around 6,400 USD. For around 500 USD more, you can get the same watch on a so-called ladder bracelet which, as its name suggests, features middle links arranged like a ladder.


El Primero 21 – Precise to 1/100th of a Second

In 2017, Zenith introduced the El Primero 21, a new family of calibers that once again expands the functionality of this iconic movement. To display the time, the calibers rely on a balance that beats at an impressive 36,000 vph. The chronograph, on the other hand, has its own oscillation/escapement system that runs at a frequency of 360,000 vph or 50 Hz. This enables the movement to measure 1/100th of a second – quite a remarkable feat for a mechanical caliber!

You can find movements from the El Primero 21 line in watches from the Defy 21 and Defy Extreme collections. These movements are oftentimes intricately skeletonized, allowing the wearer to admire the finely tuned mechanics in all their glory.

A Defy 21 with a skeletonized caliber and titanium case costs around 9,800 USD on Chrono24. Versions made of ceramic or carbon are slightly more expensive and cost between 12,000 USD and 14,500 USD. If you'd prefer a rose gold Defy 21, be sure to budget around 35,500 USD. The Defy Extreme is equipped with a more robust case and costs between 14,000 USD and 19,000 USD.


Zenith El Primero Plus Tourbillon

Some Zenith El Primero calibers also boast a tourbillon. One example is the caliber EP 4035, which powers the Chronomaster Tourbillon, Pilot Type 20 Tourbillon, and Defy Xtreme Tourbillon, among others. The common thread between all these watches is the minute-tourbillon prominently displayed at the 11 o'clock position. This feature displaced the small seconds dial, which is usually at 9 o'clock.

Depending on the model and case material, prices range from around 19,000 USD for a stainless steel Chronomaster Tourbillon to nearly 46,500 USD for a black-coated titanium Defy Xtreme. The latter is water-resistant to 1,000 m (100 bar, 3,280 ft).

Zenith also offers a tourbillon version of the state-of-the-art El Primero 21, the EP 9020. This movement boasts a separate tourbillon for the time display and the chronograph. The frequencies remain the same at 5 Hz and 50 Hz, respectively, meaning you can also use watches with this caliber to time to the nearest 1/100th of a second.

Zenith currently uses the El Primero 9020 in the Defy Double Tourbillon. This watch features a skeletonized dial and comes in platinum, carbon, or sapphire crystal. Prices range from 87,500 USD to 105,000 USD, depending on the case material.

Fusee Tourbillon – Constant-Force Mechanism

One particular highlight of this luxury manufacturer from Le Locle, Switzerland, is the El Primero 4805 Fusee Tourbillon caliber. Unlike other El Primero movements, those with a fusee do not have a chronograph function. However, this mechanism ensures a constant driving force from the mainspring via a fusee and chain, resulting in extreme precision. Of course, the tourbillon at 6 o'clock is not to be overlooked.

The EP 4805 was first presented in 2015 in celebration of the company's 150th anniversary. The movement was housed in the Chronomaster El Primero Tourbillon GFJ. The last three letters of the model name, GFJ, are the initials of the company's founder, Georges Favre-Jacot. The El Primero Tourbillon GFJ is available with a ceramic or 18-karat rose gold case. Plan on spending around 64,500 USD for an unworn example. More recent models with this type of movement like the Defy Fusee Tourbillon cost between 60,500 USD and 77,500 USD, depending on the version.

El Primero Zero G – Defies Gravity

Zenith further exhibits its watchmaking prowess with the Zero G versions of the El Primero. Movements like the EP 8812 feature Gravity Control, a gyroscopic regulating module for the oscillation/escapement system that continuously realigns itself regardless of the watch's position. This ensures the balance and escapement are always in the ideal position and, thus, minimizes the effects of gravity. As a result, movements with this module boast exceptional levels of accuracy.

Watches powered by an El Primero with Gravity Control include, among others, the Academy Christophe Colomb Equation of Time, which earned Zenith the "Complicated Watch Prize" at 2011's Grand Prix d’Horlogerie de Genève. This gold watch is available on Chrono24 starting around 69,000 USD.

A more recent model with this module is the Defy Zero G, which is available in titanium, carbon, or rose gold for between 72,500 USD and 93,000 USD.


Zenith's Speedy Sports Watches

Most of the chronographs powered by the Zenith El Primero have an elegant, sporty design. The watches make great everyday watches for the office and beyond. However, Zenith also has some El Primero timepieces that are true sports watches. The Stratos Flyback and Rainbow Flyback are two such models that are particularly beloved by fans. Both watches have a 45.5-mm case, rotating bezel, and are powered by the calibers EP 405 or EP 405B. Unlike the standard El Primero, the 405 features a flyback function, meaning you can reset the chronograph to zero and start it again with the single push of a button.

You will find well-maintained examples of the Stratos Flyback and Rainbow Flyback for around 5,700 USD on Chrono24. The special edition Stratos Flyback Striking 10th with the caliber EP 4057 costs around 1,400 USD more. The chronograph seconds hand on this watch only needs 10 seconds to make a complete rotation.

Chronomaster Sport

The Chronomaster Sport joined the Zenith portfolio at the start of 2021. This timepiece is aimed at fans of classic racing chronographs. Its fixed ceramic bezel with a tenths of seconds scale is particularly reminiscent of racing classics like the Rolex Daytona or TAG Heuer Carrera. However, the dial with its tricolor subdial design clearly makes this watch a Chronomaster.

The Chronomaster Sport is outfitted with the new El Primero 3600. This movement boasts a 60-hour power reserve and, to the delight of many fans, a stop-seconds mechanism.

The 41-mm watch is available with a stainless steel or 18-karat rose gold case. Be prepared to spend around 17,500 USD on a gold version. A stainless steel watch costs around 10,500 USD on a three-piece link bracelet and 9,500 USD on a rubber strap.


The El Primero With Three Hands

At the start of 2022, Zenith unveiled a whole new line of watches powered by the El Primero caliber. The design of the Defy Skyline is a nod to classic sports watches from the 1970s. The watches in this series feature an octagonal stainless steel case, integrated bracelet, and twelve-sided faceted bezel. The sunburst dial in black, blue, or silver has a perfectly aligned pattern of engraved four-pointed stars. Applied luminescent bar indices mark the hours.

The most notable thing about the Defy Skyline, however, is that it's a three-hand watch. The hours and minutes are displayed centrally, while a subdial at 9 o'clock is home to the running seconds. The watch's EP 3620 caliber is a true El Primero, meaning the second hand only needs 10 seconds to make a complete rotation.

The official list price for a Zenith Defy Skyline is 8,400 USD.


1969 – A Pivotal Year

In the mid-1960s, the watch world was embroiled in a race to release the world's first automatic chronograph caliber. Zenith, Seiko, and a collaboration between the brands Breitling, Heuer, Büren, and chronograph specialist Dubois Dépraz were in a neck-and-neck race.

Breitling, Heuer, and Büren presented the result of their collaboration in March 1969: the Calibre 11 with a chronograph module and micro-rotor. For technical reasons, the crown of this movement was placed on the left, while the two chronograph push-pieces were on the right.

Zenith had introduced their El Primero in January 1969, i.e., two months earlier. Unlike the Calibre 11, Zenith's El Primero was an integrated chronograph movement. That meant the movement was fully designed for the purpose of timing, and its components fit together perfectly. The Calibre 11, on the other hand, had a chronograph module that was mounted onto a base movement. Though introduced first, the Zenith El Primero wasn't available on the market until the autumn of 1969. The Japanese manufacturer Seiko sold the first wristwatches powered by an automatic chronograph movement in the early summer of 1969.