Patek Philippe Nautilus Chronograph 5980/1A. Steel case diameter 44mm. Water resistant to 120 meters. Automatic Patek Philippe Calibre CH 28-250, 35 jewels, 28,800 vph, column-wheel control of chronograph movement, rotor on zirconium oxide ball bearings, seal of Geneva. Functions, hours, minutes, sweep seconds, chronograph and date. Silver dial with applied index hour markers with luminescent coating. Brushed and polished steel bracelet with double folding clasp and safety.