Launched in 2009, caliber CH 29-535 PS – the third exclusive chronograph movement – combines traditional architecture (manual winding, column wheel, toothed-wheel horizontal clutch system) with six patented innovations. In the current collection, it powers a men’s model (Reference 5172) and a ladies’ model (Reference 7150/250). In 2011, this base caliber was interpreted in a Grand Complication version incorporating a perpetual calendar (CH 29-535 PS Q), present on the 5270 and 5271 models. Since 2012, it can also be found on Reference 5204 in a split-seconds chronograph and perpetual calendar version (CHR 29-535 PS Q). The various Patek Philippe chronograph calibers are offered in the current collection in more than 20 variations – to which three new, resolutely contemporary interpretations have now been added.