iwc GROSSE FLIEGERUHR Instrucciones De Manejo página 16

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