As the heir of a grand Patek Philippe classic, the Ref. 5270 Chronograph with a perpetual calendar is now available in yellow gold for the first time – an elegant outfit for this timeless watch with a concave bezel and fluted lugs. The silvery opaline dial is superbly legible. The caliber CH 29-535 PS Q movement combines traditional design with six patented innovations and an extremely slender calendar mechanism.