IWC Schaffhausen Ingenieur Mode D'emploi page 24

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T I M E S E T T I N G
Pull out the crown to position 2. This will stop the movement.
To set the time accurately to the second, it is best to stop the
movement as the small seconds hand passes 60. Now move the
minute hand a few minute strokes beyond the time to be set. Then
po sition the minute hand by moving it gently backwards until it
is exactly above the correct minute stroke. This ensures that the
minute hand begins to move immediately when you restart the
movement. To start the small seconds hand, push in the crown
to position 0. When setting the time, please be aware of the date
change, which always takes place at 12 midnight. If this change
has already taken place at 12 noon, you must move the hands
forwards by 12 hours.
Important: The watch is water­resistant in positions 0, 1 and 2
as long as the crown is not moved. The crown should always be
screwed in again for normal use to ensure the stability of the seal
and to protect the winding mechanism.
I N G E N I E U R C H R O N O G R A P H