IWC Schaffhausen 4590 Mode D'emploi page 17

0 Normal position
1 Time setting
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.
PORTOFINO AUTOMATIC MOON PHASE 37/PORTOFINO AUTOMATIC MOON PHASE 40
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FUNCTIONS OF THE CROWN
NORMAL POSITION
0 1