IWC Portuguese Chronograph Classic Reference 3904 Watch Operating Instructions

Your IWC watch shows you the time in hours, minutes and seconds, together with the date. You can use the integrated flyback chronograph to measure any period of time in seconds, minutes and hours. Stop times can be added together. The mechanical mo-vement with automatic winding has a power reserve of approximately 68 hours when fully wound. The engraved rotor winds the watch in both directions of rotation via the IWC double-pawl winding system. Your Portuguese Chronograph Classic is protected by a convex sapphire glass of hardness grade 9 on Mohs’ scale. Your watch is water-resistant 3 bar. To ensure that this extraordinary watch continues to perform faultlessly in the future, it is essential to observe a few important operating instructions.

IWC Portuguese Chronograph Classic Reference 3904 Watch Operating Instructions ScreenshotFilename: IWA62530_REF3904_eu.pdf
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In IWC Portuguese Chronograph Classic Watch Manual

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