The Patek Philippe Nautilus Travel Time Chronograph Ref. 5990/1A-001 is a rare and highly collectible stainless steel sports watch that combines three of the most practical complications in haute horlogerie: a self-winding flyback chronograph, a dual time zone Travel Time system, and a date display coupled with local time. Introduced in 2014 as the most complicated Nautilus in the catalogue at the time, it features the signature 40.5mm porthole-inspired case with contrasting polished and satin finishes, along with the iconic horizontally embossed dial with a grey-black gradient effect that shifts in appearance depending on lighting. The Travel Time system utilizes two central hour hands: a solid hand for local time and a skeletonized hand for home time, with day/night indicators for both zones visible in apertures on the dial. Local time can be adjusted forward or backward in one-hour increments using the two correctors integrated into the left side of the case, without affecting the minutes or stopping the watch. The flyback chronograph is operated via pushers on the right, with a central chronograph seconds hand and a 60-minute counter at 6 o’clock, while an analog date indicator at 12 o’clock is synchronized with local time. Powering this sophisticated instrument is the in-house Calibre CH 28-520 C FUS, an automatic movement comprising 370 parts and 34 jewels that combines a traditional column wheel with a disk clutch for smooth chronograph operation, delivering a power reserve of 45 to 55 hours and bearing the prestigious Patek Philippe Seal. The watch is secured by an integrated stainless steel bracelet with a patented fold-over clasp and lockable adjustment system, and offers water resistance rated at 120 meters at launch. The 5990/1A-001 with its distinctive grey-black gradient dial was produced from 2014 to 2021 before being replaced by the blue-dial 5990/1A-011, making this original configuration increasingly sought after among collectors for its rarity and transitional significance. Key specifications: 40.5mm stainless steel case; 12.53mm thickness; grey-black gradient horizontally embossed dial; Calibre CH 28-520 C FUS automatic flyback chronograph with dual time zone; 370 parts; 34 jewels; 45-55 hour power reserve; 28,800 vph; Patek Philippe Seal; stainless steel bracelet with fold-over clasp; 120m water resistance; sapphire crystal caseback.
