IWC Schaffhausen PORTUGIESER AUTOMATIC Bedienungsanleitung Seite 16

Functions of the crown
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.
Date setting
If a month has fewer than 31 days, you will need to set the date manually to
the first day of the following month. Pull the crown out to position 1. You can
now set the date by turning the crown to the left (rapid advance). You should
not use the rapid-advance function between 8 p.m. and 2 a.m. because the
movement automatically advances the date during this period.
0 1 2
0 Normal position
1 Date setting
2 Time setting