IWC Schaffhausen AQUATIMER AUTOMATIC 3410 Mode D'emploi page 25

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Important: Although the watch is water­resistant in positions 0,
1 and 2, the crown should always be screwed in again for normal
use (position X). The crown must not be moved or used for any
purpose whatsoever while under water.
W I N D I N G P O S I T I O N
With the crown in the winding position (0), you can also wind
the automatic movement by turning the crown to the left by
hand. A few revolutions of the crown are enough to start the
movement. However, it is recommended to wind the watch by
turning the crown through approximately 20 revolutions as this
will ensure maximum precision. The crown must always be in
position X when you are wearing your watch.
D AT E S E T T I N G
If a month has fewer than 31 days, you will need to set the date
manually to the first day of the following month. Release the
screw­in crown and pull it out to position 1. You can now set the
date by turning the crown to the right (direct advance). You should
A Q U AT I M E R A U T O M AT I C