iwc IW3931 Operating Instructions Manual page 20

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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 carried 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
water­resistance test whenever your
IWC watch is opened and serviced.
D A V I N C I T O U R B I L L O N R É T R O G R A D E C H R O N O G R A P H