Gwyneth Paltrow wears a Cartier Tank

In the Senate hearing scene in Iron Man 2 (2010), Pepper Potts leans over Tony Stark at the witness table in spare, sharp office clothes, running Stark Industries while Stark comes apart around her. Gwyneth Paltrow plays her, and on her wrist sits a small rectangular watch, a pale dial in a steel case on a brown leather strap, the flat tank-shaped case catching the light.

The aggregator Spotern lists that watch as a Cartier Tank Louis Cartier, and the shape in the frame fits, since the long steel rectangle and slim leather strap are exactly the Tank's register. The dial never turns far enough to the camera to read a name or numerals, and no watch publication has confirmed it, so this rests on a single listing rather than anything definitive. If you can place it more precisely, or rule the Tank out, please weigh in in the comments.