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T H E T E C H N I C A L R E F I N E M E N T S O F T H E
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
Your IWC watch shows you the time in hours, minutes and sec-
onds. The mechanical movement, which is timed in five positions,
with automatic winding, a temperature-compensating balance
spring made of Nivarox
®
* of the highest quality and an unbreak-
able Nivaflex
®
* mainspring, has a power reserve of approximate-
ly 42 hours when fully wound. Your Portofino Automatic Moon
Phase 37 is protected by a sapphire glass of hardness grade 9
on Mohs’ scale. Your watch is water-resistant 3 bar. To ensure
that this extraordinary watch continues to perform faultlessly in
the future, it is essential to observe a few important operating
instructions.
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
