Since 1977, the ultra-thin caliber 240 has shown proven performance and reliability. Over the years, Patek Philippe has ...

When it comes to Patek Philippe ... an automatic Advanced Research perpetual calendar movement. The major change on Calibre 240 Q Si is the presence of a Silinvar balance wheel.

After machining, every single movement component passes through or is finished by hand, and often decorated, though many will never be seen. (Perfection inside and out is just the Patek Philippe way.) ...

Watchers of Patek Philippe have been waiting to see what would ... Stern’s other requirement was that there had to be a new movement, which is the ‘Calibre 240 PS CI J LU Instantaneous Grand Date, Day ...