IWC Schaffhausen BIG PILOT'S 5010 Mode D'emploi page 20

This watch has a screw­in crown. Screwing the crown in to its
normal position (X) prevents the inadvertent adjustment of the
time or date and also acts as a double seal to prevent water
from seeping 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 into position X
and turning it to the right at the same time, it is screwed down
firmly again and secured.
F U N C T I O N S O F T H E C R O W N
Normal position (screwed in)
X —
Winding position
0 —
1 —
2 —
N O R M A L P O S I T I O N
B I G P I L O T ' S WAT C H
— 2 0 —
X
Date setting
Time setting
0 1 2