Ladies tonneau watches have a barrel like, rectangular based shape. They are elegant, sophisticated and unique women's timepieces.
Tonneau is a barrel shaped case shape. The shape is also known as barrel watch shape. Tonneau is actually the French name for barrel.
It features convex sides (gentle curves on the sides) and a flat top and bottom. It could have a round, tonneau, short, fancy or elongated dial opening.
This shape's history is tied to the history of the wrist watch. The first tonneau shaped watch was introduced in 1912 by the luxury brand Vacheron Constantin. See more on the history here.