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IWC Schaffhausen IW376207 Da Vinci Perpetual Calendar Edition Kurt Klaus Silver Plated Index Stainless Steel Black Leather 43.1 x 51 mm Automatic
Watch Spotting: Legendary IWC Watchmaker Kurt Klaus Wearing The IWC Da Vinci Perpetual Calendar Kurt Klaus Limited Edition - Hodinkee
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Kurt Klaus, the inventor of the ingenious autonomous IWC perpetual calendar mechanism turned 80. – Watch-Insider.com
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Celebrating Leap Year with the Ultimate Modern Perpetual Calendar: IWC's Da Vinci Perpetual Calendar Edition Kurt Klaus - Grail Watch
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