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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.

Patek Philippe Nautilus ref 5711/1A-001 (2009). Even if you aren't familiar with everything "Haute Horlogerie " you probably know about the Patek Philippe Nautilus. More specifically discontinued ref. 5711 and its many head-turned variations. With its association with the high art of watchmaking and its unusual porthole-inspired design and integrated bracelet the Nautilus has become something of a cult favorite that tops many collectors' must-have lists potentially even overshadowing the Patek brand itself with its notoriety and immense demand.Ref. 5711 joined the Nautilus lineup in 2006 eventually becoming one of the brand's most sought-after watches before being discontinued just a few years ago. Models like the stainless steel ref. 5711/1A-001 are particularly desirable as demand for steel luxury watches thrives. The example here sports a remarkable blue gradient three-hand dial with a horizontal finish and a date display at 3 o'clock. This Patek is one of those watches that will likely always be very beloved in the watch-collecting community. Don't pass up the chance to own it today.