Patek Philippe 240 Q Mode D'emploi page 15

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winding
Your watch incorporates a self-winding move-
ment. The movements of your wrist set a centrifu-
gal mass in motion; this tensions the mainspring
which stores the energy. When you take off your
fully wound watch, it will continue to run at least
38 hours. When it has stopped after depleting the
power reserve, it can be rewound by hand (about
10 clockwise turns of the crown). Please wind the
watch before you put it on. This way, you can avoid
lateral pressure on the winding stem which in the
course of the years could damage the stem tube.
Your complicated self-winding wristwatch was
presented to you in a case with a winder. If you do
not intend to wear your watch for a longer period
of time, please return it to the case where the con-
stant motion of the winder will keep it wound.
Within 24 hours, the winder will operate con-
tinuously for 8 hours and then rest for 16 hours.
By using the winder, you can eliminate the need
to reset the date and time when you put on your
watch again.