The “Submariner” model appeared in 1953. At that time, the watch was water-resistant to 100 metres. The first models, without crown protection (or crown-guard), are today nicknamed “James Bond” after the watch Reference 6538 worn by “Agent 007”, played on the screen by Sean Connery (1930-2020), in the films “Dr. No” (1962), “From Russia with Love” (1963) and “Goldfinger” (1964). There are two types of “James Bond” Rolex, which can be distinguished according to the size of the crown: small or large. The Reference 6538 worn by 007 is a “Big Crown”; this model is the most popular among collectors today. This example made in 1956 features the four lines where the "officially certified chronometer" wording was added to the usual 200m=660ft and Submariner.