IWC Schaffhausen PORTUGIESER PERPETUAL CALENDAR Mode D'emploi page 31

1
The moon phase display shows the moon in the northern hemi-
sphere in the upper half and the moon in the southern hemisphere
in the lower half. It is automatically set by the calendar so that it
is always correct. The transmission ratio is so precise that the
display deviates by only a single day after 577 years.
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
— 3 1 —
M O O N P H A S E D I S P L A Y
2
Full moon
1 —
Waning moon
2 —
New moon
3 —
Waxing moon
4 —
3 4