iwc PORTUGIESER PERPETUAL CALENDAR TOURBILLON Operating Instructions Manual page 16

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the area of the last day tells you that the
power reserve is about to expire. You
should then wind the watch by hand, if
necessary, since the precision can be
reduced in this area. In order to maxi­
mize the running time of your watch, we
recommend that you wind the crown
up to 8 additional revolutions beyond
the marking of the full power reserve
(7 days).
P O R T U G I E S E R P E R P E T U A L C A L E N D A R T O U R B I L L O N