IWC Schaffhausen Stainless Steel Portugieser Perpetual Calendar Watch

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The legacy of iwc's perpetual calendar dates back to the early ‘80s, when head watchmaker Kurt Klaus engineered a wristwatch capable of accurately displaying the irregular days and leap years of the Gregorian calendar. The moonphase found on the silver-plated dial of the Portugieser Perpetual Calendar watch is another impressive feat of horology, created with such precision that it will only deviate from the moon's rhythm by one day in every 577. 5 years.

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