50525-0010 Rolex. The functions of this Cellini Dual Time watch from Rolex are hours, minutes, seconds, second time zone and day-night display. These functions are cleverly set out on a black guilloche dial that is covered by a high-tech scratch-proof sapphire crystal front glass. The dial uses elegant dauphine hands and polished index hour markers to show time. It also showcases a beautiful Rolex logo at 12 o'clock and a stylish second time zone subdial that is integrated with day-night display. The watch features a comfortable and durable black crocodile strap and a round case and domed & fluted double bezel made of 18K rose gold. 50525-0010 Rolex 18k Rose Gold Watch.