The Patek Philippe Aquanaut Travel Time ref. 5164A features a distinctive sunburst grey dial that helps differentiate it from its less complicated Aquanaut siblings, while still retaining a link to their design language. The watch's case sports the iconic soft octagonal shape of the Nautilus, with the corners of the bezel even softer than its sibling. The Aquanaut's crown guards resemble the porthole hinges that flank the Nautilus' case, providing a visual connection between the two models.

What sets the Aquanaut Travel Time apart is its more casual aesthetic, thanks to the design of the lugs, which give the watch a more everyday appearance compared to the Nautilus. Despite the increased complexity, the ref. 5164A maintains a case diameter of 40.8mm, though the addition of two pushers at 8 and 10 o'clock means it wears slightly larger. The watch's height of 13.4mm is a notable increase from the time-and-date only ref. 5167, but the added functionality is worth the trade-off.

Powering the Aquanaut Travel Time ref. 5164A is Patek Philippe's caliber 324 S C FUS movement, which enables the watch's impressive array of complications. These include a skeletonized second hour hand, twin AM/PM apertures, and a pointer date sub dial at 6 o'clock. The movement's intuitive design allows the wearer to quickly and easily view their local and home time, as well as their AM/PM status, making this Aquanaut model the ultimate sports-oriented and functional timepiece for the jet-setting lifestyle.

As a sports-oriented offering from the prestigious Patek Philippe brand, the Aquanaut Travel Time ref. 5164A has proven immensely popular with a number of high-profile celebrities. Its toned-down and casual aesthetic, with a rubber strap and softer lines compared to the brand's iconic Nautilus, make it an easier watch to wear discreetly, allowing wearers to "fly under the radar" when desired. The watch's black-on-black color scheme and relatively thick case profile further contribute to its understated presence on the wrist. As a result, the ref. 5164A has become a favorite among the rich and famous, with notable wearers including Ellen DeGeneres, John Mayer, Virgil Van Dijk, Chris Paul, and even Romeo Beckham, son of renowned footballer David Beckham. The Aquanaut Travel Time's combination of practicality, versatility, and subtle luxury continues to captivate discerning collectors and style-conscious celebrities alike.