Worn by: Sean Connery as James Bond
Reference: Gruen Precision
Brand: Gruen
Thought to be Sean Connery's personal watch, this 34mm gold-plated timepiece with 17-jewel small-seconds Swiss movement was the first timepiece worn in the Bond franchise before switching to the famous Rolex Submariner later in the same film.

Source: https://www.watchforum.com/threads/wrist-watches-in-film.1220/
Worn by: Sean Connery as James Bond
Reference: Rolex Submariner
Brand: Rolex
The Rolex Submariner Ref 6538—nicknamed the “Big Crown”—introduced the world to James Bond’s wrist. In Dr. No, Connery’s Bond wears it with a NATO strap, often visible under rolled tuxedo cuffs and dripping seawater from his dive scenes. It is not a luxury statement but a weapon of professionalism, a naval officer’s tool repurposed for espionage. When Bond checks the time before breaking into Crab Key or lighting his cigarette after killing Professor Dent, the Submariner marks each act of control with quiet menace. Its unadorned dial and oversized crown embody early Bond: brutal competence disguised as charm. Every later Bond watch, from gadget-laden to jewel-encrusted, would chase the elemental cool established by this simple diver ticking beneath Connery’s sleeve.