IWC Schaffhausen PORTOFINO HANDAUFZUG PURE CLASSIC Mode D'emploi page 26

If your watch has a strap made of leather, textile or rubber with
a leather or textile inlay, make sure that the high-quality 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.
H O W O F T E N S H O U L D M Y W A T C H B E S E R V I C E D ?
The optimal service cycle for your IWC timepiece is exclusive to
your watch
necessary interval between services will be determined by your
individual wearing habits; frequency of wear, your environment/
s, and the intensity of physical activity you engage in. Your fine
mechanical timepiece is an extension of yourself and will run well
for as long and smoothly as it is treated. Therefore, we simply
recommend you to continue wearing your watch for as long as
pleases you and to only entrust it for a service if you notice a
deviation from the regular performance, function or timekeeping.
It will then be our pleasure to reinstate the premium performance
with the suitable service.
P O R T O F I N O H A N D - W O U N D P U R E C L A S S I C
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N O T E
and unique lifestyle. The