IWC Schaffhausen DA VINCI 3764 Instrucciones De Manejo página 20

Functions of the crown
X
Normal position
This watch has a screw-in crown. Screwing the crown in to its normal
position (X) prevents inadvertent adjustment of the time or date and also
acts as a seal against ingress of water into the case. To release the crown,
unscrew it by turning it to the left, where it automatically assumes position 0,
the winding position. By depressing the crown in position X and turning it
to the right at the same time, it is screwed down firmly again and secured.
Winding position
With the crown in the winding 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 movement fully by turning
the crown through about 40 revolutions. This will ensure maximum accuracy
and a power reserve of about 68 hours, even if you are not wearing the
watch.
0 1 2
X Normal position (screwed in)
0 Winding position
1 Date setting
2 Time setting