Black w/ Arabic hour markers, Luminous hands & Luminous lume

Patek Philippe Aquanaut ref 5164A (2013). The collection was released in the late 1990s featuring a design heavily inspired by its cousin the Nautilus but with a slightly more "young" and approachable design set.  It features a similar case shape as the Nautilus including an octagonal bezel but with a "Tropical" rubber strap and a square motif on the dial. Ref. 5164A is a travel time model with two pushers on the left side of the case - the top pusher advances the hour hand while the bottom pusher moves it back allowing the wearer to sync with local time effortlessly.  When the hour hand moves it reveals a skeletonized hour hand underneath to hold the place of home time.  It's a simple and fascinating complication that makes the already desirable Aquanaut even more collection-worthy.