iwc Portugieser grande Complication Mode D'emploi page 22

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 right. 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