Valjoux (for Vallée de Joux, "Joux Valley") is a Swiss manufacturer 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, and is a member of the Swatch Group. Historically, Valjoux provided the movements for early Rolex Daytona references e.g. 6263.
Valjoux 7750
Valjoux is responsible for the design and manufacture of the Valjoux 7750 movement (and variants), an extremely popular movement used in many mechanical chronograph watches.[1]
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