IWC Schaffhausen PORTUGIESER PERPETUAL CALENDAR Mode D'emploi page 29

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Recommendation: Your authorised IWC Official Agent must carry out a
water-resistance test whenever your IWC watch is opened and serviced.
How often should my watch be serviced?
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 November 2010.
Technical specifications subject to change.