An example of an industrially executed cam driven chronograph.
The name Valjoux comes from "Vallée de Joux", a mountain region of Switzerland associated with chronograph design and construction. Valjoux was founded in the "Valley de Joux" in the mid-to-late part of the 19th century. When the watch business collapsed in the latter half of the 20th century, Venus chronograph manufacturer failed and Valjoux bought them, thereby Valjoux attained the rights to the new cam/lever and switch of Cal 188 that Venus had made. This was rebranded as Val 7730 and sold for a year or two until the Valjoux redesign of this movement was made - the 7733.