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The Patek Philippe Aquanaut Travel Time is the perfect watch for the frequent flier who already has everything.The 1990s saw the arrival of smart-casual and business-casual clothing in the workplace. The Patek Philippe Aquanaut—which drew inspiration from the midsize reference 3800 Nautilus—was launched in 1997 as the quintessential watch for this era: it was suitable for diving and other sporty activities but could be worn equally well in the boardroom or, in case of this particular model, on a private jet.The Aquanaut bears a striking resemblance to the Nautilus with its porthole-inspired octagonal bezel and with alternating satin-brushed and polished finishes. Nevertheless, it has a uniquely sporty look thanks to the rubber strap and the matching embossed black dial.The ref. 5164 was introduced in 2011 and was the very first Aquanaut with a complication. The watch features a dual time-zone function, which means that the local time can be read on the regular hands and the home time is displayed by a skeletonised GMT hand. Two pushers on the left-hand side of the case allow for the easy adjustment of the GMT hand in one-hour increments. Moreover, two small apertures display day/night indicators for the local and home time zones.The watch features a 40.8 mm stainless case and a thickness of 10.2 mm. The see-through sapphire case back provides an uncensored view of the expertly finished automatic movement with a 21k yellow-gold rotor.The watch dates back to 2014 and has just returned from a complete service at Patek Philippe. It comes as a full set and on a black rubber strap with stainless steel Patek Philippe butterfly clasp.