iwc PORTUGIESER PERPETUAL CALENDAR Mode D'emploi page 26

Recommendation: Your authorised IWC Official Agent must carry out a
water-resistance test whenever your IWC watch is opened and serviced.
Servicing your Portuguese Perpetual Calendar
Although the parts in this watch are all manufactured from top-quality mate-
rials, a number of components are subject to natural wear and tear. It is par-
ticularly important to ensure that the points at which wear occurs are always
well-lubricated and that oil contaminated by metal abrasion is regularly re-
moved. For this reason, we recommend that you have your watch serviced
approximately every five years. Please contact an authorised IWC Official
Agent or send your watch directly to the IWC Customer Service Department
in Schaffhausen.
Effective from October 2005.
Technical specifications subject to change.