Rolex Cellini Dual Time 39mm 50529 Silver Guilloche Dial

The Cellini Dual Time to differentiate daytime hours from night-time hours, a sun or moon symbol transits the aperture at 9 o’clock on the sub-dial. The hour hand can be set independently to a new local time zone, without disturbing the functioning of the watch or the chronometric precision of its self-winding movement.