iwc Schaffhausen Mode D'emploi page 26

Water-resistance
Your IWC Official Agent must perform a new water-resistance test every
time your IWC watch is opened and serviced.
Recommendation: We recommend that you have your watch's water-
resistance tested once a year by an approved IWC Official Agent.
Service for your Portuguese Perpetual Calendar
All the parts in this watch are manufactured from top-quality materials. Never-
theless, a number of parts are subject to natural wear and tear. It is particularly
important to ensure that points at which wear occurs are always optimally
lubricated and that contamination of the oil caused by metal-to-metal abrasion
is regularly removed. This is why we recommend that you have a maintenance
service carried out on your watch about every five years. Please contact an
approved IWC Official Agent or send your watch directly to the IWC Customer
Service Department in Schaffhausen.
Status October 2005.
Technical specifications subject to change.