IWC Schaffhausen Mark XVI Mode D'emploi page 23

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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 and unique lifestyle. The
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.
Effective from October 2011.
Technical specifications subject to change.
p i l o t ' S W a t c h M a r k X V i F o r F a t h e r a n d S o n