Worn by: Arnold Schwarzenegger as Major Alan "Dutch" Schaefer
Reference: Seiko H558-5000
Brand: Seiko
Arnold Schwarzenegger wore the Seiko reference H558-5000 "Arnie" on his massive wrist as he led a team of commandos through the jungle being hunted by an extraterrestrial warrior. The bulky, multifunctional watch with its "tuna can" case and analog-digital display became iconic among Seiko aficionados, earning its "Arnie" nickname from appearances in Schwarzenegger's action films and inspiring a contemporary Prospex re-edition.

Source: https://teddybaldassarre.com/blogs/brands/movie/references/watches