iwc PORTUGIESER PERPETUAL CALENDAR Mode D'emploi page 20

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Functions of the crown
0
Normal position
With the crown in the normal position (0), you can also wind the automatic
movement by hand. A few revolutions of the crown are enough to start the
movement. However, it is better to wind the watch by turning the crown
through approximately 20 revolutions as this will ensure maximum accuracy.
The crown must always be in position 0 when you are wearing your watch.
Quick-setting the calendar
Pull out the crown to position 1. In this position, you can use the rapid-advance
function to move the calendar forwards one step at a time by turning the crown
slowly to the left. The calendar must not be adjusted between 8 p.m. and
2 a.m.
0 Normal position
1 Quick-setting the calendar
2 Time setting
1 2