Rolex Date Reference 1500 Black Sigma DialWhen 34mm is the new black The Rolex Date reference 1500 is a cool 34mm watch that has become more of a focus with collectors over the past year or so. We are offering a lovely example with a cool matte black sigma dial in lovely original condition (with a couple of very slight surface marks) and white text and great rich lume. The term Sigma refers to the small Greek sigmas that sit either side of the T SWISS T on Rolex dials from the early 1970s.