Rolex Datejust 1601 Grey Sigma DialSigma signifies something special This is a very cool looking vintage Datejust, with a superb grey dial with crisp white text. The pie pan dial features sigma markings either side of the T SWISS T that signifies that the hour markers are made from 18kt gold, in this case white gold. The lume plots and lume in the hands have taken on a very pleasing patina. The case and bezel are in great and strong all round condition. The folded link jubilee