Worn by: Dennis Quaid as Gordon Cooper
Reference: Omega Speedmaster
Brand: Omega
The story of the beginning of NASA's space program and the first seven Mercury astronauts. The movie is based on Tom Wolfe's book and starts with Yeager going through the sound barrier. US Airforce pilots are recruited for the space program and you'll see astronauts Shepard, Glenn, Cooper, Grissom, et cetera. And of course, you will see some Speedmaster watches on the wrists of the astronauts. Cooper is played by Dennis Quaid, who also featured in Frequency (2000) wearing his Speedmaster.
Source: https://www.fratellowatches.com/speedmaster-in-movies/