iwc DA VINCI CHRONOGRAPH Mode D'emploi page 18

The technical refinements of the Da Vinci Chronograph
Your IWC watch shows you the time in hours, minutes and seconds,
together with the date. You can use the integrated flyback chronograph to
measure any period in seconds, minutes and hours. Stop times can be
added together. The mechanical movement with automatic winding has
40 jewels (synthetic rubies) and a power reserve of approximately 68 hours
when fully wound. Your Da Vinci Chronograph is protected by sapphire
glass, convex on one side, of hardness grade 9 on the Mohs' scale. Your
watch is water-resistant 3 bar. To ensure that this extraordinary watch con-
tinues to perform faultlessly in the future, it is essential to observe a few
important operating instructions.