IWC, Ocean Timepiece series, model: IW379503, automatic winding, 44mm, movement: in-house 89365 automatic chronograph movement, 36 jewels, frequency 28,800 vibrations per hour, power reserve 68 hours, decorated with Geneva stripes and pearl stripes, supports stop-seconds time adjustment • Core functions: Timing (hours / minutes / seconds), flyback and reverse jump, date display, SafeDive diving timing system. The inner and outer double-rotating bezels prevent misoperation, and it is water-resistant to 300 meters • Dial: Black matte dial, bronze-colored luminous hour markers and hands, date window at 3 o 'clock, inner bezel with SafeDive diving chronograph system, and external rotatable bezel for precise operation even during diving