IWC Schaffhausen Da Vinci Mode D'emploi page 20

Functions of the crown
X
Normal position
This watch has a screw-in crown. The screw-in connection (normal posi-
tion, position X) prevents unintentional adjustment of the time or the date,
and the watch case has double protection against penetrating water.
To release the secure crown, unscrew it by rotating it to the left, where it
automatically assumes position 0, the winding position. By depressing
the crown in position X and rotating it to the right at the same time, it is
screwed down firmly again and secured.
Winding position
In the winding position (position 0), you can also wind the automatic move-
ment by hand. The movement will start after only a few revolutions of the
crown. However, it is better to wind the movement fully with about 40 revo-
lutions of the crown, as maximum accuracy and a power reserve of about
68 hours will then be assured, even after taking off the watch.
0 1 2
X Normal position (screwed in)
0 Winding position
1 Perpetual calendar quick setting
2 Time setting