The earliest known examples of the legendary Rolex "Cosmograph" Daytona first surfaced circa 1961. The model derived its name from the famed Daytona 24 hour car race for which Rolex was a sponsor. These chronographs were made in limited production but rarest among them were those that were fitted with a "Paul Newman" dial. The most distinguishing feature of a "Paul Newman" dial, which separates it from other Daytonas, is the use of small square markers on the subsidiary dials rather than plain indexes. Additionally the subsidiary dial for minutes has indications at 15, 30, 45 and 60, whereas basic Daytonas will only have markers at 20, 40 and 60. These main characteristics, among others, are what make the present watch highly desirable among collectors.