Calatrava Pilot Travel Time Ref. 5524

That Patek Philippe should present a pilot watch is unexpected to say the least. Yet the Genevan firm already has credentials in the field, as shown by the two hour-angle wristwatches, or siderometers, that are on display at the Patek Philippe Museum. This Calatrava Pilot Travel Time with second time zone is equipped with the 324 C FUS calibre, whose setting mechanism was patented in 1996. When the local-time hand is moved forwards or backwards in one-hour increments using the two pushers in the case, an isolator uncouples the time-zone mechanism from the going train. This prevents any incidence on the amplitude of the balance or the regularity of its oscillations, hence the watch continues to run with the same precision.