Worn by: Christian Bale as Patrick Bateman
Reference: Seiko 5
Brand: Seiko
Obsessively competitive New York City investment banker and serial killer Patrick Bateman wore a Seiko 5 ref. SNXJ90 that stood in for a steel-and-gold Rolex Datejust. Rolex was not on board with its brand being associated with such a reprehensible, murderous character, so the film used this Japanese-made watch that bears a passing resemblance to the Datejust, with a 38mm case, gold-tone fluted bezel, white dial with day-date display, and five-link Jubilee-style bracelet with gold-plated center links. Despite the impostor watch, the movie helped supercharge the Rolex Datejust's popularity among young, ambitious Wall Streeters.
Source: https://teddybaldassarre.com/blogs/brands/movie/references/watches