Introduced last month at Baselworld 2012, the Patek Philippe Ref. 5204 Grand Complication  is a split seconds chronograph with perpetual calendar, based on Patek Philippe’s in-house CH 29 movement.    For me, the aesthetics of this piece lean a bit too much towards the “busier” end of the spectrum (more of a Nautilus type, I am), but this said there is much to like about this piece — it is a Patek Grande Complication with platinum case, after all.   The movement in this piece is also impressive, as one would expect from Patek.  The Patek CH 29-535 PS Q builds on the CH29 movement used the ref. 5170J and the ref. 5270G, and it is technically and visually magnificent.  Here’s a few looks…

Patek Philippe Ref 5204 Grande Complication

 40mm platinum case (14.19mm thick), manual wind mechanical movement (See Below for specs), alligator strap with matching platinum clasp

 Patek Philippe Chronograph Caliber CH 29-535 PS

with six patented innovations

manual wind mechanical movement, 65 hour power reserve, 32mm x 8.7mm thick (perpetual calendar mechanism 1.65mm, 1.7mm split mechanism), 496 components (182 for perpetual calendar, 42 for flyback), Patek Philippe seal