Patek Philippe Cushion Shaped Perpetual Calendar in 18k Yellow Gold Ref. 5940J with Original Certificate of OriginPatek Philippe is well versed in crafting perpetual calendar watches, which are consistently sought after by collectors worldwide. In fact, Patek has been making them since 1925, when they introduced the first perpetual calendar wristwatch in history. Cushion shaped watches have also enjoyed popularity at Patek Philippe since the Art Deco movement swept through the world. At hand, we have an 18k yellow gold specimen that we absolutely love! The