iwc MARK XVIII Operating Instructions Manual page 6

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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 TS
O F T H E P I LOT ' S WATC H M A R K XV I I I
Your IWC watch shows you the time in hours, minutes and
seconds together with the date. The mechanical movement with
automatic 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 pro-
tection 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