ETA Valjoux 7750 caliber automatic watch movement

ETA/Valjoux Caliber 7750

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Eta Valjoux 7750 Drawing

Brand ETA / Valjoux
Caliber Number 7750
Based On Valjoux 7733 (manual wind)
Movement Type Automatic
Jewels 25 (see below)
Diameter 13 1/4”’ (30mm)
Height 7.9mm
Power Reserve ~48 hours
Lift Angle 49 degrees
Vibrations Per Hour 28,800 (4 Hz) – early models were 21,600
Shock System Incabloc
Regulator System ETACHRON
Chronograph System Three-plane cam style
Rotor Ball bearing system
Winding Direction Uni-directional
Hands 2mm x 1.2mm x .25mm + 3 x .18mm (needs confirmed)
Hacking? Yes
Features Hours, minutes, small seconds, central chronograph seconds, 30 minutes counter, 12 hours counter, day, date
Country of Manufacture Switzerland
Known Models Breiting, 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.

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

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

Button sequence: Top, top, bottom.

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.

Extra Information

  • Official ETA 7750 tech sheet with parts list here

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

Please share your experiences and thoughts about the ETA/Valjoux caliber 7750 in the comments section below…

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KeepTheTime.com
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Also found in a Hamilton Khaki X-Wind

Dr. Anson
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Dr. Anson

Absolutely flawless workhorse movement.

Lay
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Lay

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

Joel
Guest
Joel

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
Guest

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

Igor Kozlov
Guest

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

trackback

[…] 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: […]

trackback

[…] 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
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Graham Boulter

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
Guest
Javaid iqbal

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

trackback

[…] ETA/Valjoux 7750 […]

trackback

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

Has Watch
Guest
Has Watch

Does the 7750 always have 25 jewels?

Don Leidya
Guest
Don Leidya

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
Guest
Mike C

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
Guest
Cisco

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
Guest
Albert L J Hall

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 a TAG with a 7750 and no better spec than say a STEINHART cost three or even four timers as much. And why do they… Read more »

Bobby Bleu
Guest
Bobby Bleu

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
Guest

Victorinox also uses the 7750 in the Air Boss Mach 9

trackback

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

Tony
Guest
Tony

The Victorinox Airboss Mach 9 uses this movement.
comment image

Gary Van Daele
Guest
Gary Van Daele

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

Gwilym Jones
Guest
Gwilym Jones

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
Guest
Albert L J Hall

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 a TAG with a 7750 and no better spec than say a STEINHART cost three or even four timers as much. And why do they… Read more »

Michael E
Guest
Michael E

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

Michael E
Guest
Michael E

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

Captain Meatpipes
Guest
Captain Meatpipes

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
Guest
Andre

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

Thomas Aureli
Guest
Thomas Aureli

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

Richard Flair
Guest
Richard Flair

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 shock. Needless to say, I’m disappointed.

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