IWC Schaffhausen BIG PILOT'S WATCH B I G DATE 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. With the crown in the winding position (0),
you can wind the watch by turning the crown clockwise. Your
watch has a power reserve of approximately 8 days (192 hours).
To ensure maximum accuracy, you should wind your watch fully
every day as a matter of routine. By depressing the crown into
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 W AT C H B I G D AT E
— 2 0 —
X
Date setting
Time setting
0 1 2