iwc PORTOFINO CHRONOGRAPH Mode D'emploi page 26

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 pro-
cedures 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 li-
ability claims.
Recommendation: Your authorised IWC Official Agent
must carry out a water-resistance test whenever your
IWC watch is opened and serviced.