IWC Schaffhausen PILOT'S WATCH MARK XVIII Mode D'emploi page 22

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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 I L O T ' S W A T C H M A R K X V I I I
Your IWC watch shows you the time in hours, minutes and
seconds together with the date. The mechanical movement with
auto matic winding has a power reserve of approximately 42 hours
when fully wound. Your Pilot's Watch Mark XVIII is protected by a
sapphire glass of hardness grade 9 on Mohs' scale. The glass is
retained securely in the case at low pressure, for example when
a drop in air pressure occurs at extreme altitudes. Your watch is
water-resistant 6 bar. The soft-iron inner case provides protection
against magnetic fields. To ensure that this extraordinary watch
continues to perform faultlessly in the future, it is essential to
observe a few important operating instructions.
P I L O T ' S W A T C H M A R K X V I I I