Rolex Datejust 1601 rare Singer Block Markers dialFrom concept to series In the end of the 1960s the famous Dial maker company Singer was asked by multiple swiss manufactures to design new dial proposals for their model lines. In their famous 1967 1968 catalogue they presented new design studies, print techniques, markers and finishes to multiple brands. In this catalogue some of the most famous Rolex dials started to see their light like the Yach master Daytona and early versions of the exotic