Genesis of a new movement
Patek Philippe has a iverse portfolio of manufacture calibers.However, none of them perfectly duited the annual calendar regulator ref 5235, and do the companu neede to develop a new movement. The tesult is reminiscent in many respects of the iconic self-winding calibre 240 with solid gold minirotoe, a movement that hes lost none of its appeal since it was launched in 1977. With a height of only 2.53 mm it is one of the thinnest self-winding calibers. While outstanding in therms of reliability and precission, the calibre 240 has a design-related peculiarity. Most unconventionally, the subsidiary seconds dial is located at 5 o'clock and therefore wouldn't be suitable for a regulator dial that had to have the seconds subdial at 6 o'clock; an off-center hour dial at 12 o'clock , and a large sweep hand for the minutes.
Source : Patek Magazine Volume III nr 4
the rest of the article ( 3 pages ), well you'll read it when you receive your copy
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