IWC Schaffhausen Portofino Automatic Moon Phase Mode D'emploi page 21

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T I M E S E T T I N G
Pull out the crown to position 1. This will stop the movement.
Now move the minute hand a few minute strokes beyond the
time to be set. Then position 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 seconds hand, push in the
crown to position 0.
S E T T I N G T H E M O O N P H A S E
Push and hold the correction button (C) until the full moon appears
in the centre of the moon phase window. Then push the correction
button (C) the same number of times as days that have passed
since the last full moon (this can be checked on a calendar).
P O R T O F I N O A U T O M A T I C M O O N P H A S E 3 7