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Ela Valjoux Caliber 7751

ETA/Valjoux Caliber 7751

Ela Valjoux Caliber 7751

BrandETA / Valjoux
Caliber Number7751
Base Caliber
ETA 7750
Movement TypeAutomatic
Diameter13 1/4”’ (30.00mm)
Power Reserve44 hours
Vibrations Per Hour28,800 BPH
Shock SystemIncabloc
FeaturesHours, minutes, small seconds, central chronograph seconds, central date hand, day of the week at 12:00 (left side), month at 12:00 (right side), 30 minutes chronograph counter at 12:00, 12 hours chronograph counter at 6:00, moonphase indicator at 6:00, 24 hour time at 9:00
Country of ManufactureSwitzerland
Known ModelsPlease add yours to comments below…

The ETA/Valjoux caliber 7751 is a 25 jewels Swiss made self-winding automatic movement. This extremely multi-functional caliber is based on the legendary ETA/Valjoux caliber 7750 chronograph, but with additional complications including a full moon phase indicator at 6:00, a central date hand pointing to the date in the outer perimeter of the dial, day of the week and month windows at 12:00, and a 24 hour hand at 9:00.


ETA 7751


Setting the time

When setting the time on your caliber 7751 watch, do not attempt to do so while the hands on the watch are displaying between 8:00PM and 2:00AM. Before adjusting anything, be sure to move the hands to a time outside of this zone – this is to make sure the date flipping sequence at midnight has occurred. For the moonphase, do not make adjustments between 8:00PM and 6:00AM. Doing so can cause serious damage to the calendar gears in the movement.

  • Winding – Neutral (position) 1 is hand-winding position. If your watch is equipped with a screw down crown, unscrew it and you will be in position 1.
  • Time – Pull the crown out 2 clicks (position 3). Turn the crown clockwise or counterclockwise to set the time.
  • Day of the week – Use the pusher on the side of the watch near the 10:00 position
  • Date – Pull the crown out one click (position 2) and turn it counterclockwise
  • Month – While in date setting mode (position 2 and turning counterclockwise) continue to change the date until it passes the 31st of the month. This will advance the month indicator to the next month. Keep doing this until your current month is selected, stopping on the day.
  • Moonphase – Pull the crown out one click and turn clockwise until your desired moonphase setting is reached.

Chronograph Sequence

The chrono sequence on the VD51B is the same as most chronograph watches:

  • Start – top button
  • Stop – top button
  • Reset – bottom button

Note: If your chronograph isn’t running, it’s most likely due to your watch not having enough power reserve. Simply wind the watch fully before engaging the chronograph function. Also be aware that running the chronograph makes use of additional gears in the movement and will cause your overall power reserve to run out faster. This should not be an issue as long as you are wearing the watch.

Watches with this caliber

The pictured example of the ETA caliber 7751 was found in a Dubey & Schaldenbrand Gran Chrono Astro.

This movement has been custom decorated by the manufacturer. The movement has a hand-engraved decorated gold finish. The rotor is skeletonized and blued steel screws can be spotted throughout. Dubey & Schaldenbrand proudly states that their use of this caliber has a chronometer-quality escapement.


More watches with caliber 7751

Additional Resources:

Please share your experiences and thoughts about the ETA/Valjoux caliber 7751 in the comments section below…

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3 years ago


2 years ago

Beautiful, & dependable movement. It makes an incredible watch at an affordable price point! I own 3.

2 years ago

I have one of these I’ve been wearing for a couple of weeks and the accuracy is very impressive. Someone really did a great job of adjusting it. It is able to keep within one second of NIST time for days on end. This is only with wrist movement. No winding.

Graham Caliber G1749 Watch Movement |
1 year ago

[…] 7751 (12/6/9 subdials with central date hand, day/month at 12, moonphase at 6) […]

Antonio Arias
Antonio Arias
1 year ago

This caliber is also bases for Omega 3606 and 1152, used in some models of the Speedmaster Day-Date, with refs 3220.50 and 3520.50

Carlos D. Montemayor
Carlos D. Montemayor
1 year ago

I have the Tourneau 2010 in black Moonphase edition. Let me tell you, even nearly a decade later, I feel honored to have this watch. The style of the watch is breathtaking and the movement is gorgeous, a gorgeous and magnificent technological masterpiece of watch engineering. I take very good care of it, and it looks new. I have two other expensive watches, one being a Cartier, and it’s not worth the same in style… Read more »

7 months ago

As well implemented in Longines Master Collection Automatic Chronograph Men’s Watch L27734783

Richard Teevan
Richard Teevan
17 days ago

Hello: I have an older (1990-2000’s) Dubois et Fils – triple Cal-moonphase Gold case watch with the 7751. Only issue is the date pusher at 10:00 Broke for the 2nd time arggh . I Will get repaired again, as i love the racing themed lumed numbers on the white dial.

Thomas Westphal
Thomas Westphal
17 days ago

I own 3 different watches that contain the 7751, 1: Omega, 2: Invicta 3: SWI. I love all 3 of them, especially the SWI, I like the case, and band. The 7751 has proven itself to be very durable, and accurate, plus it’s very impressive with its multiple complications.

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