The ETA/Valjoux 7750 chronograph winds clockwise only, at a rate of 650 to 800 turns per day.
| Rotation direction | Clockwise only |
| Turns per day | 650 to 800 |
| Power reserve | Approx. 48 hours |
| Type | Cam-actuated chronograph |
A special case worth knowing
The 7750 uses a unidirectional pawl winding system. Unlike most modern automatics, it only winds the barrel in one direction.
Setting a winder to anticlockwise for a 7750 means it turns for nothing. The mistake gives no visible sign: the device runs, and the watch runs down in two days.
Alternating mode also works, since it covers the useful direction half of the time. If your winder does not offer a clockwise-only setting, this is the option to choose.
The most produced chronograph in the world
Designed in 1973 by Edmond Capt, the 7750 powers a considerable share of the automatic chronographs on the market: Breitling, IWC, TAG Heuer, Sinn, Fortis, Hamilton, Tudor and a long list of others, often under in-house names.
The Sellita SW500 is its modern equivalent, with the same setting: clockwise only.
Should you leave the chronograph running?
No. A chronograph left running permanently puts unnecessary load on the additional gear train and uses more energy, so the power reserve drops noticeably.
Stop and reset the chronograph before placing the watch on the winder. It is good general practice and takes two seconds.
The weight of the calibre
The 7750 is a bulky movement, and watches fitted with it often weigh more than 150 grams. Check that your winder's cushion holds a case of this weight securely: a cushion that is too soft lets the watch slip during rotation.
Our removable cushions adjust to the case diameter, from a classic 36 mm to a 45 mm chronograph.
Frequently asked questions
Which direction should a Valjoux 7750 be wound?
Clockwise only, between 650 and 800 turns per day. Anticlockwise, the watch does not wind.
Does alternating mode work with a 7750?
Yes, it covers the clockwise direction half of the time. In that case stay towards the top of the range, around 800 TPD.
Is the Sellita SW500 set like the 7750?
Yes: clockwise only, 650 to 800 TPD.
Should the chronograph be stopped on the winder?
Yes. Stop and reset it before placing the watch on the winder, otherwise the power reserve drops.
Which watch winder to choose
For a single 7750 chronograph, a single watch winder set to clockwise is enough, provided the cushion holds a heavy case. If the 7750 sits alongside bidirectional watches, choose a model with independently adjustable rotors such as the Pégase Watch Winder, so each watch can be set separately.
Other calibres
See our Settings by calibre page, or our watch winders with adjustable programmes.
A question about your chronograph? contact@maisonorvian.com