iwc PORTUGIESER PERPETUAL CALENDAR TOURBILLON Operating Instructions Manual page 19

CROSSING TIME ZONES AND
THE INTERNATIONAL DATE
PORTUGIESER PERPETUAL
CALENDAR TOURBILLON
-11 -10 -9 -8 -7
Setting when crossing time zones:
– When crossing time zones in an east­
erly direction, you should simply set
the time forward to the new local
time.
P O R T U G I E S E R P E R P E T U A L C A L E N D A R T O U R B I L L O N
— 1 9 —
LINE WITH THE
-6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11 +12