Tonneau
![[[Girard-Perregaux Richeville Chronograph "Monte-Carlo 1954"]]\\ with **tonneau shaped case** (click to enlarge!)](/lib/exe/fetch.php?tok=416c83&media=https%3A%2F%2Fwww.uhren-wiki.com%2Fimages%2FGirard-Perregaux_Richeville_Chronograph_Monte-Carlo_1954.jpg "[[Girard-Perregaux Richeville Chronograph \"Monte-Carlo 1954\"]]\\ with **tonneau shaped case** (click to enlarge!)")
Girard-Perregaux Richeville Chronograph "Monte-Carlo 1954"
with tonneau shaped case
© Girard-Perregaux
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.