iwc IW3903 Operating Instruction page 16

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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 U G I E S E R C H R O N O G R A P H C L A S S I C
Your IWC watch shows you the time in hours, minutes and seconds, together with the
date. You can use the integrated flyback chronograph to measure any period of time
in seconds, minutes and hours. Stop times can be added together. The mechanical
move ment with automatic winding has a power reserve of approximately 68 hours
when fully wound. The engraved rotor winds the watch in both directions of rotation
via the IWC double­pawl winding system. Your Portugieser Chronograph Classic is
protected by a convex sapphire glass of hardness grade 9 on Mohs' scale. Your
watch is water­resistant 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 U G I E S E R C H R O N O G R A P H C L A S S I C