Patek Philippe is known for their mechanical innovations and master craftsmanship when creating and producing complicated watches. In 2011, they introduced a champion of everyday practicality with the Aquanaut Travel Time reference 5164. It featured a practical 3-hands dual-time function - building upon the historical Cottier-developed travel time movement found on reference 2597. A notable improvement to the original design is the addition of day and night indications for both local and home time. The time zone is set via two pushers in the left band, similarly to ref. 2597. Acclaimed by collectors as one of the most interesting model line evolutions introduced by Patek Philippe.

In 2014, the company transferred the complication to their flagship sports model - the Nautilus - and even juiced up the package with the addition of a flyback chronograph. This compelled a series of aesthetic and technical adaptations. Most notably, the dial now features two symmetrical, vertically aligned subdials - one for the date, the other for the chronographic minutes - creating a sense of superior balance. Technically, the incorporation of the travel time pushers in the left "flap" of the case is an incredibly clever and practical detail, allowing for fast and easy setting without dramatic alterations to the Genta design of the case.

Fresh to the market and double sealed, this specimen of reference 5990 is most likely one of the very few left in this untouched condition.