iwc PORTUGIESER PERPETUAL CALENDAR Mode D'emploi page 26

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Water-resistance
The water-resistance of IWC watches is stated in bar and not in metres.
Metres, which are often used elsewhere in the watch industry to indicate
water-resistance, cannot be equated with dive depth because of the test
procedures that are frequently used. Water-resistance shown in metres pro-
vides no indication as to actual use of the watch in the presence of moisture
and wetness, and in or under water. Recommendations for use in connection
with the water-resistance of your watch can be found on the Internet at
www.iwc.com/water-resistance. Your authorized IWC Official Agent will also
be pleased to provide you with information.
To ensure that your watch continues to function perfectly, you should have it
checked by an IWC service centre at least once a year. Your watch should also
be tested after exposure to unusually harsh conditions. If the tests are not car-
ried out as stipulated, or if the watch is opened by unauthorized persons, IWC
will accept no warranty or liability claims.
Recommendation: Your authorized IWC Official Agent must carry out a
water-resistance test whenever your IWC watch is opened and serviced.