iwc 5005 Mode D'emploi page 16

The technical refinements of the Big Ingenieur
Your IWC watch shows you the time in hours, minutes and seconds, as
well as the date and the power reserve. The case with its screw-in crown
and sapphire glass of hardness grade 9 on Mohs' scale protects the internal
workings of the watch against external influences. The mechanical move-
ment with automatic winding visible through the case back has 42 jewels
(synthetic rubies) and a power reserve of 7 days (168 hours) when fully
wound. The engraved rotor with its 18 ct. gold medallion winds the watch
in both directions via the automatic Pellaton winding system. The Big
Ingenieur is shock-proof and water-resistant 12 bar. To ensure that this
extraordinary watch continues to perform its tasks in future, it is essential to
follow a few important operating instructions.