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In 1963, Rolex introduced the reference 6239, the very first model of the iconic Cosmograph (later fully dubbed the Daytona). Of the major changes to prior models, the tachymeter scale was moved from the dial to the bezel, and the earliest version of the bezel was calibrated to 300 units per hour. This “Mark 1” bezel is recognizable by the 275 intermediate unit, and the small hash marks found along the entirety of the bezel. Further, the earliest Ref. 6239 were fitted with the highly coveted “double Swiss” dial, which meant that the country of origin designation is printed twice on the dial at 6 o’clock (which the second Swiss being covered mostly by the bezel). Since the Daytona’s bezel was larger than previous models, and covered a larger portion of the dial, Rolex stamped the dial again with an inner SWISS to ensure visibility.
The Rolex Daytona offered here is a lovely example. The case appears unpolished, with thick and even lugs, and no wear to the sides of the case. The dial is in excellent condition, with no damage and no tool marks, typically seen inside the registers. The tritium lume is present on both dial and hands, albeit with some partial loss to the plots on the dial, and has aged to a darker yellow color.
The watch comes on a Rolex stretch rivet 7205/57 bracelet, dated to the 3rd quarter of 1963, with 12 full links, and minimal stretch. Please note that one of the endlinks is not marked 57, but appears to be original.