IWC Schaffhausen DA VINCI AUTOMATIC Mode D'emploi page 21

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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 else-
where 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 provides 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 con-
nection with the water-resistance of your watch can be
found on the Internet at www.iwc.com/water-resistance.
Your authorised IWC Official Agent will also be pleased
to provide you with information.
To ensure that your watch continues to function perfect -
ly, 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 carried out as stipulated, or if the watch is
opened by unauthorised persons, IWC will accept no
warranty or liability claims.
Recommendation: Your authorised IWC Official Agent
must carry out a water-resistance test whenever your
IWC watch is opened and serviced.