The IWC Portugieser Perpetual Calendar 44 (IW503404) is a masterpiece of watchmaking. Crafted from 18k 5N red gold, this 44.2mm watch features a slate gray dial with a perpetual calendar that automatically adjusts for month lengths and leap years. The automatic IWC caliber 52615 provides a 7-day power reserve. A black alligator leather strap and transparent case back complete the design.

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