The Patek Philippe Nautilus Chronograph (ref. 5980/1A-001) features the Caliber CH 28-520 C mechanical automatic movement; black-blue dial with date display at 3 o'clock; chronograph complication with 60-minute and 12-hour counters together in a single elegant monocounter at 6 o'clock; center sweep seconds hand, which also serves as the chronograph hand; and 40.5mm, stainless steel case with an integrated stainless steel, Nautilus-style bracelet.