Audrey Tautou wears a Baume & Mercier Hampton

Sophie Neveu raises a hand to her brow in a dim interior, and the gesture brings her wrist into the light. The watch there has a rectangular case with a pale dial and a black strap, the tank-style shape standing out against her dark sleeve.

The French watch and luxury site montres-de-luxe identifies the watch as a Baume & Mercier Hampton Classic, whose elongated rectangular case fits what is visible here. This rests on a single publication and the dial detail is not readable in the frame, so it is a best guess rather than a settled fact. Corrections in the comments are welcome.