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The chronograph is operated with two buttons.
The one at 2 o'clock starts and stops a measure-
ment. The button at 4 o'clock is used to reset
the stopped chrono hand or activate the flyback
function when the chrono hand is running. The
patented Patek Philippe Annual Calendar is a full
calendar that automatically recognizes months
with 30 and 31 days and, assuming that the watch
is always running, only needs to be manually cor-
rected once a year on March 1. It displays the day of
the week, the date, and the month in three aper-
tures, and it also controls the day/night display at
6 o'clock.
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