IWC Schaffhausen AQUATIMER AUTOMATIC 2000 Mode D'emploi page 22

Functions of the crown
X
Normal position
This watch has a screw-in crown. The screw-in connec-
tion (normal position, 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.
2
1
0
X Normal position
(screwed in)
0 Winding position
1 Date setting
2 Time setting