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Introduced in 1996 and patented by Patek Philippe,
the Annual Calendar is the first timekeeping mech-
anism 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 traditionnally used in perpet-
ual calendars to the greatest possible extent, Patek
Philippe's engineers designed an architecture that
relies mostly on wheels and pinions. Hence, the
324 S QA LU 24H caliber consists of 356 parts and
the 26-330 S QA LU caliber consists of 339 parts,
whereas a conventional perpetual calendar with a
moon-phase display needs only around 280 compo-
nents. The calendar indications are complemented
by a 24-hour dial. Additionally, the Annual Calendar
models feature an extremely accurate moon-phase
display that deviates from the true lunar cycle by
only one day every 122 years.
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