iwc Ingenieur Automatic IW3239 Operating Instructions Manual 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
i n g e n i e u r a u t O M a t i c
Your IWC watch shows you the time in hours, minutes and sec-
onds, together with the date. The watch is water-resistant 12 bar
and protected by a sapphire glass of hardness grade 9 on Mohs'
scale. The mechanical movement with automatic winding has a
power reserve of approximately 42 hours when fully wound. The
soft-iron inner case provides protection against magnetic fields.
To ensure that this extraordinary watch continues to perform fault-
lessly in the future, it is essential to observe a few important op-
erating instructions.
i n g e n i e u r a u t O M a t i c