iwc PORTUGIESER PERPETUAL CALENDAR TOURBILLON Operating Instructions Manual page 9

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is a way to overcome this problem
caused by one of the basic laws of
physics: the balance, the pallets and
the escape wheel are mounted in
a minute cage that rotates around
itself once every minute. In this way,
the effect of the gravitational error is
practically elim inated. To ensure that
this extraordinary watch continues to
perform faultlessly in the future, it is
essential to observe a few important
operating instructions.
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