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The Patek Philippe Ref. 3940 can confidently be called one of the most succesfull perpetual calendars from Patek Philippe. And for two reasons: firstly, it is a watch with a great movement, and secondly, this reference was built by Patek Philippe for twenty-one years, starting in 1985. Even for Patek Philippe that’s an impressively long period. And that Ref. The 3940 is something special and this is proven by the fact that Patek Philippe’s former president, Philippe Stern, wears this watch every day.