ROLEX DIAL AND CALENDAR DAY DISCS REF. 1803 DAY-DATE Rolex Dial with Calendar Discs for Ref. 1803. White with applied yellow gold baton indexes and luminous dots, outer 1/5th seconds track with 5-second Arabic markers, apertures for the day and date, to fit Cal. 1555, 1556. Rolex Oyster Perpetual Day-Date, Superlative Chronometer, Officially Certified.