iwc Mark XVII Mode D'emploi page 20

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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
Your IWC watch shows you the time in hours, minutes and sec-
onds together with the date. The mechanical movement with
automatic winding has 21 jewels (synthetic rubies) and a power
reserve of approximately 42 hours when fully wound. Your Pilot's
Watch Mark XVII 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 en-
sure 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