IWC Schaffhausen PORTUGIESER PERPETUAL CALENDAR 42 Mode D'emploi page 29

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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.
PORTUGIESER PERPETUAL CALENDAR 42