Yea the new Nautilus with perpetual calendar is interesting, but I think this is more interesting and attractive:  the very first chronograph in the Patek Philippe Aquanaut collection, with a dose of orange to top it off.  The overall looks is great for the sporty Aquanaut collection and this is a welcome addition.  The watch is cased in steel, inside being the automatic mechanical Patek caliber CH 28-520 C.  Not a new caliber, the 28-520 C is present in numerous Nautilus chronographs.  It is a flyback chronograph movement with classic column wheel and vertical disk clutch that prevents a rebound of the hand in either direction when the chronograph is started.  Because this clutch is virtually friction-free, the chronograph hand can also be used as a continuously running seconds hand.  The watch has a black embossed dial with gold applied numerals that are luminescent, and is offered in both orange and black rubber composite straps.  As I say a very nice look for the Aquanaut, although the price tag is a rather hefty $43,770. Patek Philippe Aquanaut Chronograph 5968A
42.2 mm x 11.9mm steel case

Patek Philippe Caliber CH 28-520 C
Chronograph with 60-minute and 12-hour mono-counter. Date. Diameter: 30 mm. Height: 6.63 mm. Parts: 308. Bridges: 13. Jewels: 35. Power reserve: Min. 45 hours – max. 55 hours. Central rotor in 21K gold, unidirectional winding. Balance:Gyromax®. Vibrations/hour: 28 800 (4 Hz). Balance spring: Spiromax®. Hall...