Rebecca Hall wears a Cartier Tank

Claire Keesey shares a quiet cafe date with Doug MacRay in The Town, leaning on her hand across the marble table while the camera catches her left wrist. The watch sits face up just below her chin, its gold case and black leather strap clear against her white blouse.

The rectangular gold case on a black leather strap reads as a Cartier Tank, most likely the Tank Louis Cartier rather than a steel bracelet version. The watch database watch-id.com catalogues this same piece as a Cartier Tank for Rebecca Hall in the film, which lines up with what is visible on screen, so the call sits at likely rather than certain. If you can confirm the exact Tank reference, please add it in the comments.