iwc IW3905 Operating Instruction 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 seconds hand passes 60. You can now set the
time by turning the crown and positioning the minute hand exactly
above the minute stroke. To start the 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 water-resistant in positions 0, 1 and 2
as long as the crown is not moved. The crown should generally
always be screwed in for normal use to ensure the stability of the
seal and to protect the winding mechanism.
P o r t u g i e s e r Y a c h t c l u b c h r o n o g r a P h