iwc DA VINCI AUTOMATIC Operating Instructions Manual page 6

Technical refinements of the Da Vinci Automatic
Your IWC watch shows you the time in hours, minutes and
seconds as well as the date in large numerals. The watch is
water-resistant 3 bar and is protected by a sapphire glass of
hardness grade 9 on Moh's scale that is convex on one side.
The heart of your Da Vinci Automatic is a mechanical auto-
matic movement with 22 jewels (synthetic rubies), a tempe-
rature-compensated balance spring made of Nivarox of the
highest quality, timed in five positions, and an unbreakable
Nivaflex winding spring. To ensure that this extraordinary
watch continues to perform faultlessly in the future, it is
essential to observe a few important operating instructions.