iwc 5449 Mode D'emploi page 14

The technical refinements of the Portuguese Minute Repeater
Your IWC watch shows you the time in hours, minutes and seconds, and
the striking mechanism chimes out the time in hours, quarters and minutes.
The mechanical movement, visible through the case back, has 52 jewels
(synthetic rubies) and a power reserve of approximately 46 hours when fully
wound. Your Portuguese Minute Repeater from IWC is a mechanical
masterpiece. In addition to the uniqueness of its functions, it is the ease with
which it can be used that distinguishes this watch from all other complicated
timepieces. To ensure that this extraordinary watch continues to perform
faultlessly in the future, it is essential to observe a few important operating
instructions.