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Valjoux (for Vallée de Joux, "Joux Valley") is a Swiss Made of mechanical watch movements, based in L'Abbaye, in the canton of Vaud, Switzerland, located in the Jura-Nord Vaudois district in the Vallée de Joux. It is known primarily for chronograph ébauche movements that are used in a number of mid- to high-range mechanical watches. The company is a part of ETA SA, and is a member of the Swatch Group. They are also the movement providers for early Rolex Daytonas such as 6263.
The Valjoux 7750 is different from most other chronograph movements, using the three-plane cam system rather than the column wheel. It is constructed of a mainplate, calendar plate, and chronograph top plate. Levers push a cam back and forth, driving the stopwatch mechanism of the Valjoux 7750. This is referred to as a coulisse-lever escapement. The Valjoux 7750 is the first watch movement developed using computer-assisted design. In the 1980s, many companies began using the Valjoux 7750 because it was easier to mass-produce and distribute in high volume. The Valjoux 7750 can be created in several different displays, including adding or eliminating a date window or adding or subtracting a subdial. Watch companies can purchase the movement and alter it in house if they desire.
Some watch brands that use base movements manufactured by Valjoux include Appella, Breitling SA, Christopher Ward, Cyma Watches, Deep Blue Watches, Dreyfuss & Co., Fortis Uhren, Gallet, Glycine, Hamilton Watch, IWC, Steinhart, Invicta Watch Group, Junghans, Longines, Louis Erard, Mido, Nixon Watches, Omega SA, Oris, Panerai, Porsche Design, Sector No Limits, Sinn, TAG Heuer, Tissot, Tutima, Xezo, and Zodiac Watches.
There are also a large number of derivative chronograph movements based on the Valjoux 7750 base. These include ETA's own Valgranges, designed for larger watches, as well as the following third-party movements:
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