Patek's president had the non-chronograph Ref. 1527 perpetual calendar, one of only two 1527 made around 1943, made for and worn by himself. It is now in the Patek Philippe Museum.
Most common strap size on this line: 20 mm Source: Revolution
Charles Stern's watches
Business1 documented fact
Charles Stern is documented wearing the Patek Philippe Perpetual Calendar. Each watch below links to its strap size and story.
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