IWC Schaffhausen PORTOFINO AUTOMATIC DAY & NIGHT 37 Mode D'emploi page 25

– If you turn the hour hand forwards: The hand will now be
positioned between 12 midnight and 1 a.m. Now turn the hour
hand forwards to the correct time. If you are setting the watch
in the afternoon, you must turn the hand past 12 (noon) again.
– If you turn the hour hand backwards: The hand will now be
positioned between 11 p.m. and 12 midnight. Now turn the
hour hand backwards to the correct time. If you are setting the
watch in the morning, you must turn the hand past 12 (noon)
again.
– Now push the crown to position 0.
P O R T O F I N O M I D S I Z E A U T O M A T I C D A Y & N I G H T
— 2 5 —