Model: Nautilus Reference: 5980/1A-019 Date: Purchased 20th January 2015 Movement: 35-jewel Cal.CH 28-520 C automatic, free-sprung Glucydur balance with timing weights, adjusted to heat, cold, isochronism and 5 positions, gold rotor with engraved Calatrava symbol, No.5680740 Dial: Ridged white, luminous filled baton hour markers, black outer 1/5th second divisions, date aperture at 3, subsidiary dial at 6 for seconds, 30 minute and 12 hour recording, polished baton hands with luminous inserts, centre chronograph hand Case: Brushed and polished 3-part case, exhibition back, crown flanked by twin buttons, No.4573187 Strap/Bracelet: Brushed and polished link Buckle/Clasp: Signed folding clasp Signed: Case, dial & movement Size: 41mm Accompaniments: Patek Philippe box, outer card, Certificate of Origin, service letter dated 15th April 2021, service pouch 注脚 The reference 5980/1A is the largest and one of the sportiest Nautilus models to date. It houses the new self-winding automatic column-wheel chronograph movement, calibre 28-520 C, featuring a sweep centre seconds/chronograph hand with flyback function. The unusual mono-counter sub-dial indicates elapsed time on two concentric scales graduated from 0 to 30 and from 30 to 60, with the central section being calibrated as a 12-hour counter.