Patek Philippe Perpetual Calendar 5140G with Extract of the Archives and Box in 18k White GoldWe are big fans of perpetual calendars, and few brands do it betterafter all, Patek Philippe not only invented this complication but also helped create the market for it! At hand, we have a lovely reference 5140G in 18k white gold, featuring a refined 37mm case size. It succeeds the legendary reference 3940, a model widely regarded as one of the most significant creations in Patek Philippes modern era. Alongside the 3970, the 3940 is often celebrated