IWC Portofino Chronograph Reference 3910 Watch Operating Instructions

Key to the Portofino Chronograph, The functions of the crown, Normal position, Date and day setting, Time setting, Setting your watch correctly, Reading the chronograph, Using the chronograph, Adjusting the Milanese mesh bracelet, Sizing the Milanese mesh bracelet, Water-resistance, Servicing your Portofino Chronograph

IWC Portofino Chronograph Reference 3910 Watch Operating Instructions ScreenshotFilename: IWA50391_REF3910_eu.pdf
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In IWC Portofino Chronograph Watch Manual

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