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ETA Valjoux 7750 caliber automatic watch movement

ETA/Valjoux Caliber 7750

Eta Valjoux 7750 Drawing

BrandETA / Valjoux
Caliber Number7750
Based OnValjoux 7733 (manual wind)
Movement TypeAutomatic
Jewels25 (see below)
Lignes13 1/4”’
Diameter
30mm
Height7.9mm
Power Reserve~48 hours
Lift Angle49 degrees
Vibrations Per Hour28,800 (4 Hz) – early models were 21,600
Shock SystemIncabloc
Regulator SystemETACHRON
Chronograph SystemThree-plane cam style
RotorBall bearing system
Winding DirectionUni-directional
Hands2mm x 1.2mm x .25mm + 3 x .18mm (needs confirmed)
Hacking?Yes
Service Interval
~5 years
FeaturesHours, minutes, small seconds, central chronograph seconds, 30 minutes counter, 12 hours counter, day, date
Country of ManufactureSwitzerland
Known ModelsBreiting, Tag Heuer, IWC, Chronoswiss, Alpina, Sinn, Maurice Lacroix, Oris… Too many to list! Please add yours to comments below…

The pictured example of the ETA/Valjoux caliber 7750 is one of the most recognizable and widely used automatic chronograph watch movement. It was based on the manual wind Valjoux caliber 7733, which itself was based on the Venus 188. Today, it is part of the “Mecaline” line of ETA movements. It was officially introduced t0 the watch world around 1973/1974 but after the first run was manufactured, the caliber wasn’t produced again until 1985 (thanks to mechanical timepieces gaining popularity once again). The 7750 was partially designed on a computer – a first for the watch industry.

Val 7750 vs ETA 7750:

Valjoux was a movement manufacturer that designed and produced the caliber 7750. Valjoux is now part of ETA. What used to be called the Valjoux 7750 is now called the ETA 7750, unless of course it is an original 7750 that was made by Valjoux before becoming part of ETA.

ETA officially calls it the “ETA 7750” on their tech sheets and drawings. Sometimes ETA also refers to it the “ETA 7750 Valjoux”. On Caliber Corner, we usually refer the these movements as ETA/Valjoux caliber 7750. Some watch brands refuse to call it the ETA 7750 and will list the movement as a Valjoux 7750 in their specs.

Brief History of Valjoux/ETA:

Valjoux (the name comes from Vallée de Joux) joined Ebauches SA (ESA) in 1944. ESA was acquired by SMH (Société de Microélectronique et d’Horlogerie). SMH, which was a combination of SSIH (Société Suisse pour l’Industrie Horlogère) and ASUAG (Allgemeine Schweizerische Uhrenindustrie AG), later turned into the Swatch Group (1985) and the absorbed Valjoux became part of ETA.

7750 Variations

As with other ETA movements, the 7750 is available in elabore, top, and chronometer grade. In addition to the base caliber 7750, the current lineup also includes the 7751, 7753, and 7754 variations.

  • 7750 (12/6/9 subdials with day/date at 3)
  • 7751 (12/6/9 subdials with central date hand, day/month at 12, moonphase at 6)
  • 7753 (3/6/9 subdials with date at 4)
  • 7754 (12/6/9 subdials with date at 3 and GMT hand)

There are also manual wind calibers 7760 (12/6/9 subdials with day/date) and 7765 (12/9 subdials with date).

Jewel Count:

Most modern examples of the caliber 7750 will have 25 jewels. The first versions had 17 jewels. There are other versions with 24 jewels.

Plastic Parts:

If you see plastic parts in your caliber 7750 watch movement, do not be alarmed. It does mean you have a fake watch! The reset lever (stop lever) on the central chronograph wheel is constructed from plastic on many 7750s. Chronoswiss was the first watch company to start using a metal stop lever, which ETA subsequently began using as well. According to ETA, the parts made from plastic should not be cleaned during a service.

Day/Date:

Although the caliber 7750 was engineered to have a day/date calendar complication at 3:00, it doesn’t mean your watch will have either one. Some watch companies opt for a cleaner design without the day/date or with just a date.

Other Brands:

Since patent protection has expired on caliber 7750, other movement manufacturers have started to make their own version of the 7750. Sellita has the SW500 which is based on the 7750 and some of the Chinese companies are producing Chinese 7750 movements, for example the Shanghai 3LZF2.

7750 Chronograph Operating Instructions:

Pictured below is an image of a paper instruction manual for an ETA 7750 from 8-2-2005.

Eta Caliber 7750 Instructions - 414 889 02-02-2005

Chronograph start/stop/reset:

Button sequence: Top, top, bottom.

  • Top button: Start/Stop
  • Bottom button: Reset

Eta Valjoux 7750 Chronograph Instructions

Chronograph Hand Lining Up:

Unlike quartz powered chronograph movements, mechanical watches do not have the luxury of using a reset sequence to get the chronograph hand to line up to 12:00. If your caliber 7750 powered watch has a hand that is not lining up, it could be a mechanical problem and should be inspected by a professional watchmaker. Your watch may need serviced or the hand might need to be reinstalled.

Is it OK to Leave the Chronograph Seconds Constantly Running?

It is not recommended to leave the central chronograph sweeping second hand in a constantly running or engaged state. With the way the gear train is set up on the 7750, this could add extra and unnecessary wear and tear. Additionally, by doing so your watch will experience a change in amplitude, leading to a loss of power reserve and accuracy.

Examples of Watches with the Cal. 7750:

The ETA/Valjoux in the photo below is from a Kobold Phantom Chronograph watch. It was custom decorated by the manufacturer.

ETA Valjoux 7750 caliber automatic watch movement

The below example of the caliber 7750 is from a Hamilton BeLOWZERO Chronograph.

Hamilton Caliber ETA 7750

This ETA 7750 example was submitted by Detroit Watch Company of their DWC M1 Woodward exhibition caseback series.

ETA 7750 in a Detroit Watch Company M1 Woodward

Additional Resources:

  • Official ETA 7750 tech sheet with parts list here
What do you think about ETA/Valjoux Caliber 7750? Keep comments respectful and follow our community guidelines.
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KeepTheTime.com
KeepTheTime.com
• 5 years ago

Also found in a Hamilton Khaki X-Wind

Dr. Anson
Dr. Anson
• 4 years ago

Absolutely flawless workhorse movement.

Lay
Lay
• 4 years ago

That’s a beautiful finished 7750 in the pic above. Thanks for sharing.

Joel
Joel
• 3 years ago

I have a chronometer grade one of these in my Omega Speedmaster Date 3210.50. Reset it for the date every month and it’s never more than 5-10 seconds off of atomic time. Great movement!

Chris
Chris
• 3 years ago

Superb movement. Top grade is used in Marathon’s CSAR military watch.

Igor Kozlov
Igor Kozlov
• 3 years ago

I just bought BrelluM Duobox Chronometer from http://www.brellum.ch
Great movt and exellent watchmakers work by Sebastien Muller.

trackback
Swiss Army Victorinox Alpnach 241195 | KeepTheTime Video Reviews
• 3 years ago

[…] Alpnach Chronograph Watch Reference: 241195 Movement: Automatic, Swiss made, 25 jewels Caliber: ETA Valjoux 7750 Case: Stainless steel Diameter: 43mm (48mm including crown, 34mm dial) Thickness: 15mm Weight: […]

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Breitling Chronomat Longitude Thunderbirds Limited Edition Watch (HD Video Review) | KeepTheTime Video Reviews
• 3 years ago

[…] Model: A20048 with A61172 (UTC Module) Movement: Automatic (UTC is quartz) Caliber: Breitling 13 (Valjoux 7750), Breitling 70 (UTC) Case: Stainless steel Diameter: 41mm (43mm including crown, 33mm dial) […]

Graham Boulter
Graham Boulter
• 2 years ago

I have recently purchased a Torgoen T36 chronograh with a Valjoux 7750 movement. Great watch but had it six days and it just stopped ! Thought it had wound down despite wearing it every day. Coaxed it into life for a short time but it just stopped again and nothing will coax it into life. Any ideas ?? P.S. Bloody hard to wind manually !

Javaid iqbal
Javaid iqbal
• 2 years ago

I have this movement in my victorinox swiss army infantry watch.

trackback
IWC Caliber 79350 Watch Movement | CaliberCorner.com
• 2 years ago

[…] ETA/Valjoux 7750 […]

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Hamilton Caliber H-31 Watch Movement | CaliberCorner.com
• 2 years ago

[…] Found in the Hamilton Pan Europ limited edition watch, this caliber H-31 is a variation of the ETA/Valjoux 7750. […]

Has Watch
Has Watch
• 2 years ago

Does the 7750 always have 25 jewels?

Don Leidya
Don Leidya
• 2 years ago

ORIS BIG CROWN TIMER CHRONOGRAPH (Ref: 675.7648.4234.LS)
Oris 675 caliber has ETA 7750 as base. I am a proud owner of this watch, +/- 5-10 seconds per month. Great movement.

Latest Oris using Sellita, I hope it as good as ETA

Mike C
Mike C
• 2 years ago

Of all of the “vintage” watches I own, my 2008 Oris BC3 Chrono has this movement and while I haven’t officially had it measured, I can tell you that it’s MAYBE running about a minute fast after more than a month of wear. Very glad I own it.

Cisco
Cisco
• 2 years ago

Man I must be getting old if 2008 is considered vintage now. Anyway, I’ve heard good things about Oris watch and your BC3 sounds like it’s keeping perfect time. May I ask, do you use the chronograph often?

Albert L J Hall
Albert L J Hall
• 1 year ago

Forgetnto mention MIDO which is part of the SWATCH group and is now in the top five chrono makers. By the way most of the watchwes that use the ETAS Valjoux 7750 ar guilty of the ‘form over function disease. Take a rather small sized movement [ fits into a 37mm case easily] put itt into as REALLY oversized case, up the price by a couple of thou and Bobs yer brothers brother. Why does… Read more »

Bobby Bleu
Bobby Bleu
• 2 years ago

Just bought a Baume & Mercier Clifton Club Shelby Cobra Special edition Chronograph that uses this movement, Haven’t had it long enough to comment on how good it is yet. Just wanted you to be able to add my watch to your list.

Gary
Gary
• 2 years ago

Victorinox also uses the 7750 in the Air Boss Mach 9

trackback
ETA Caliber 7753 Watch Movement | CaliberCorner.com
• 2 years ago

[…] The ETA/Valjoux caliber 7753 is an automatic cam type chronograph movement. This movement is from the same family as the caliber 7750. […]

Tony
Tony
• 2 years ago

The Victorinox Airboss Mach 9 uses this movement.
comment image

Gary Van Daele
Gary Van Daele
• 2 years ago

Makes the Airboss the best value with watches having a 7750. Display back also.

Gwilym Jones
Gwilym Jones
• 2 years ago

I’m sorry, this is a question not a comment. I hope you don’t mind but I bought a tag Aquaracer in October last year (2017) it’s number is CAY2110 is the movement an ETA7750 or a SELLITA? Many thanks.

Albert L J Hall
Albert L J Hall
• 1 year ago

Forgetnto mention MIDO which is part of the SWATCH group and is now in the top five chrono makers. By the way most of the watchwes that use the ETAS Valjoux 7750 ar guilty of the ‘form over function disease. Take a rather small sized movement [ fits into a 37mm case easily] put itt into as REALLY oversized case, up the price by a couple of thou and Bobs yer brothers brother. Why does… Read more »

Michael E
Michael E
• 1 year ago

I just got the Glycine Combat Chrono beautiful view of the 7750 on the back!

Michael E
Michael E
• 1 year ago

Just got my Glycine Combat Chrono with a beautiful view of the 7750 in the back!

Captain Meatpipes
Captain Meatpipes
• 1 year ago

My Oris TT1 has the 7750 and the rotor actually massages your wrist it spins so flawlessly, great movement perfect time keeping. Unfortunately the zipper heads have copied this movement for mass production.

Andre
Andre
• 1 year ago

My Fortis Flieger Professional Chronograph had this movement as well. Fantastic watch and a reliable movement!

Thomas Aureli
Thomas Aureli
• 1 year ago

Also cased in my new TechnoMarine BlackReef 515021 50ATM DIVE WATCH

Richard Flair
Richard Flair
• 1 year ago

I have an 18 month old Hamilton Khaki King Chronograph which uses this movement. Moisture has penetrated the movement so I shipped back to Hamilton. They sent the following response: “Movement shows signs of moisture Bezel shows signs of shock Moisture damage evident on the hands” To repair they want to charge me $370. Isn’t this movement shock resistant? The watch has a two year manufacturer warranty which Hamilton will not honor because of the… Read more »

Nuno
Nuno
• 1 year ago

I have Zeno Watch Basel with this movent, very reliable, 6 years with no service, keeps time well, the only cons is push buttons for crono is hard to push.

trackback
Fortis Watch Review: The Fortis Pilot Classic Chronograph - Watch Ideas
• 1 year ago

[…] about this Fortis watch review and found out that their chronographs usually utilize the iconic ETA-7750 caliber which made me initially […]

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ETA/Valjoux Caliber 7751 Watch Movement | CaliberCorner.com
• 1 year ago

[…] ETA 7750 […]

William S Erb
William S Erb
• 11 months ago

Just got an ad on Facebook for an $1100 watch and they brag Seiko uses irt.

WTFizutalkinbout
WTFizutalkinbout
• 8 months ago

Seiko does not use the ETA 7750 movements. Never have and never will. They don’t have to because they make all their own movements for their watches. I can’t even think of who would be mentioning Seiko and ETA7750 in the same ad!

Captain Meatpipe
Captain Meatpipe
• 8 months ago

They make their own movements absolutely, however if you loosened your helmet, you’d know they partnered with Valjoux briefly in late 90s using what’s referred to today as 7750 movement, the higher ups noticed it wasn’t cost effective because seiko wasn’t know as they are today, those models are highly sought after. THE Super Slope Diver and Dink my pink ladies version go in upwards of like 50 bucks, those zipperheads are just nutty froot… Read more »

Rusty
Rusty
• 8 months ago

Do you happen to know the average weight of the Valjoux 7750 movement? One day from now to the last 10 years old? Does not have to be exact, just a rough estimate. I own a Festina Chronograph in solid 18k yellow gold, and it has the Valjoux 7750 movement in it, and I’m trying to guess the weight of the actual movement. The entire watch weighs 152 grams. Any info would be much appreciated.… Read more »

LEONARDO DE PAULA JORDAO
LEONARDO DE PAULA JORDAO
• 10 months ago

Also Found in a Bell & Ross, by SINN 103

trackback
ETA 7750 or Valijoux 7750
• 7 months ago

[…] @rcsub, some further reading material for you to chew on…ETA/Valjoux Caliber 7750 Watch Movement | CaliberCorner.com Reply With […]

Berton Kanne
Berton Kanne
• 4 months ago

I have a Alexander brand Chrono with this movement. Outstanding performance and accuracy except it starts changing the date at least three hours before midnight. Is this typical?

Dillon R
Dillon R
• 4 months ago

I’ve had maybe 20 watches with this 7750 movement over the years. Not a one of them changed dates at 12 AM on the nose. I can recall the day starting to flip 3 hours before midnight and then the date not flipping until hours later after midnight. I even had one that began the changeover after midnight at 2 or 3 AM. I am sorry to say that I can only add my experience… Read more »

Terry Watkins
Terry Watkins
• 2 months ago

I own a Heuer 13.1 chronograph ( valijoux 7765) which I love. Can anyone advise if sweep hand should be zeroed or running in every day use.

watchman48
watchman48
• 2 months ago

I own a Baume & Mercia formula S with this valjoux7750 it has always worked flawless from when I purchased it and is still going strong

Renaldo Valentin
Renaldo Valentin
• 29 days ago

I’ve enjoyed the 7750 over the years in many different watches. Bulova Accutron, Victorinox, & Tissot just to name a few. My experience is that after settling in the everyday watch winder, they all ran consistently at +5 seconds a day. That is about average specs for this movement to the +/- a day. Now a couple years ago I got a Tissot chrono that still uses a 7750 not their newer collaborated movements w/… Read more »

Brian
Brian
• 27 days ago

My Maurice LaCroix Masterpiece MP-6318 is powered by a modified 7750 – Great movement

trackback
ETA Caliber 7754 Watch Movement | Caliber Corner
• 27 days ago

[…] caliber 7754 is based on the ETA/Valjoux 7750. The main difference between the two movements is that the 7754 has an additional GMT hand (second […]