This long-awaited chronograph presents a combination of two long-standing Patek Philippe specialties last seen only in a single piece from the 1940s. The elements of the new mechanical CH 28-520 HU movement are the self-winding CH 28-520 PS chronograph calibre with column-wheel control and a vertical clutch as well as the World Time module based on a concept by Genevan watchmaker Louis Cottier in the 1930s.
For the new model, the chronograph movement and the World Time mechanism were enhanced with extensive modifications, such that the calibre CH 28-520 HU can legitimately be called a new movement. Patek Philippe’s commitment to userfriendliness can be seen in the start/stop pusher at 2 o’clock and a reset pusher at 4 o’clock that doubles as a flyback pusher. Because the chronograph hand can be used as a permanently running seconds hand without undue wear.
The World Time function is also very easy to use: The hour and minute hands indicate the time in the city and time zone, shown at 12 o’clock. The time in the 23 other zones can be quickly determined with the city disk and the two-coloured 24hour ring.