iwc 3719 Mode D'emploi page 29

Water-resistance
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The water-resistance of IWC watches is stated in bar,
and not in metres. Metres, as often used elsewhere in
the watch industry to indicate the water-resistance,
cannot be equated with the dive depth of a dive because
of the test procedures that are frequently used.
Metres also do not permit any conclusions to be drawn
about the actual uses in the presence of moisture,
wetness and in or under the water. Recommended uses
in conjunction 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.
In order to ensure its perfect function, your watch must
be tested by an IWC service point at least once a year.
Testing must also be performed after exposure to
exceptional stresses. If these tests are not performed
as stipulated, or if the watch is opened by unauthorized
persons, IWC will decline any 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.