IWC Schaffhausen PORTUGIESER TOURBILLON RÉTROGRADE CHRONOGRAPH Mode D'emploi page 19

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curacy, depending on the position of the watch. Fortunately, there
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 practic-
ally eliminated. 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 T O U R B I L L O N R É T R O G R A D E C H R O N O G R A P H