Worn by: Jake Gyllenhaal as Louis Bloom
Reference: Breitling Chronomat
Brand: Breitling
Louis Bloom wears a Breitling Chronomat Evolution with a large 44mm case, white dial, and bold numerals on the subdials—representing the height of the big watch moment of the early-to-mid 2000s. The watch is stolen in the opening scene when Bloom violently attacks a security guard and takes it from his wrist. Throughout the film, the oversized Breitling dangles loosely on Gyllenhaal's wrist (often upside down), never quite fitting due to the actor's dramatic weight loss for the role. The ill-fitting watch becomes a visual metaphor for Bloom's ill-gotten gains and his disturbing attempt to project success.

Source: https://www.hodinkee.com/articles/jake-gyllenhaal-wears-a-stolen-breitling-in-nightcrawler