Rolex Cosmograph Daytona 6263 Silver Sigma Dial 22/18 - Original tropical “MARK II”

- Original tropical “MARK II” dial

one for winding the movement and the other for rotating the inner 24-hour bezel

Singer unveiled a variety of design concepts

gilded Valjoux calibre 72

showing light signs of wear and fitted with its original 18k white-gold Patek Philippe folding clasp

Rolex Cosmograph Daytona 6263 Silver Sigma Dial 22/18 - Original tropical “MARK II”The Rolex Daytona was first introduced in 1963 as the Cosmograph reference 6239, designed specifically for professional racing drivers to measure speed and elapsed time. Around 19641965, the Daytona name began appearing on the dial, marking Rolexs role as official timekeeper of the Daytona International Speedway. Its story is defined by three distinct eras manual wind, automatic Zenith powered, and modern in house references evolving from a slow