Having spent six patents and the development of five years, the company released a new Patek Philippe chronograph with manual winding, created to and from the factory on their own. The basis is the chronograph caliber CH 27-70.
The newly caliber CH29-535 PS entered the main line of 21 gauge (which are presented in different versions of 45) of the model number of Patek Philippe. Chronograph found in the body of ladies watch with a new design. A newer model with a sleek and rounded, cushion-shaped case called simply – Ladies First Chronograph (first chronograph for ladies).