IWC Schaffhausen Mark XVI Mode D'emploi page 22

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 unusual-
ly harsh conditions. If the tests are not carried out as stipulated,
or if the watch is opened by unauthorized persons, IWC will ac-
cept 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.
Leather is a natural and permeable material. Make sure, therefore,
that the high-quality leather strap does not come into contact
with water, oily substances, solvents, cleaning agents or cosmetic
products. This way you can prevent discoloration and premature
ageing of the material.
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