====== Tonneau ======
{{wst>image_cl|Girard-Perregaux|Richeville Chronograph Monte-Carlo 1954|[[Girard-Perregaux Richeville Chronograph "Monte-Carlo 1954"]]\\ with **tonneau shaped case**|220px}}

Case shape

**Tonneau** (French) for ton or barrel barrel-shaped watch housing, today a very popular kind of case design.

A further development of the tonneau shape, with a higher complexity of curvature, can be found at the [[Cintrée Curvex]] case, which is used by [[Franck Muller]] for many of his watches.


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