Dating to approximately 1972, this early ref. 6263 example features a “MK I” dial which is notable for its absence of the red “Daytona” signature above the 12-hour register and two lowercase Greek Sigma letters at 6 o’clock. The well-preserved silver dial contrasts elegantly with the “MK I” black bezel and registers, which have aged into an even dark chocolate colour tropical patina, adding depth and character to the watch. The present timepiece is paired with ref. 7835-19 Oyster folded bracelet.

The present example is distinguished by its exceptionally rare “MK I” dial, produced only for a short period between approximately 1970 and 1973. What sets this piece apart is the presence of “tropicalised” registers: a transformation caused by prolonged exposure to UV light and humidity. These environmental factors trigger a chemical reaction in the original dial paint, resulting in a gradual and often unpredictable colour shift from black to various degree of brown. While most dials from this era remain unchanged, only a small number develop into rich mocha or caramel tones like the present example, creating a warm and visually captivating patina.

Beyond the “tropicalised” registers, the dial of this watch remains remarkably well-preserved. The luminous material on both the dial and hands remains intact and continues to react under UV light. This combination of rarity, character, and preservation makes the present example especially compelling for connoisseurs of vintage chronographs.