Rolex first started experimenting with mechanical chronographs during the 1930s, but it was not until 1963, with the introduction of the reference 6239, that an actual name was given to their chronograph line of watches.
Although many consider this reference to be the first Daytona, it was not until almost 1965 that the "Daytona" name actually made its debut appearance on the dial. In those two years before the addition of the Daytona name, Rolex’s chronograph line was known simply as the "Cosmograph" - a name that still remains on the Daytona dials that are manufactured today.
WATER RESISTANT: 100m
CASE DIAMETER: 40MM
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