Patek Philippe Annual Calendar
© Patek Philippe
Annual Calendar is a wristwatch by Patek Philippe.
First mechanical wristwatch with patented annual calendar. Overall, the self-winding movement Calibre 315 QA and the display of date, day of the week and month requires more components than the known Patek Philippe Calibre 240Q with perpetual calendar 316 instead of 275. The mechanism is programmed so that it takes account of the different month lengths from 1 March to the end of February. Only then a small correction is necessary.