Patek Philippe 324 S QA LU ANNUAL CALENDAR Mode D'emploi page 4

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Introduced in 1996 and patented by Patek

Philippe, the Annual Calendar is the first time-

keeping mechanism that automatically displays the

month, the day of the week, and the correct date

under consideration of months with 30 and 31 days,

so it only has to be adjusted once a year on March 1.

Its construction represented a formidable challenge.

To eliminate rockers and levers to the greatest pos-

sible extent, Patek Philippe's engineers designed an

architecture that relies mostly on wheels and pin-

ions. The caliber 324 S QA LU movement consists

of 328 parts, whereas a conventional perpetual cal-

endar with a moon-phase display needs only around

280 components. The calendar indications are com-

plemented by an extremely precise moon-phase

display that deviates from the true lunar cycle by

only one day every 122 years.

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