Patek Philippe Calatrava in 18k Yellow Gold Ref. 3520 Porcelain Dial with Original Certificate of Origin "Clous de Paris"In 1932, Patek Philippe introduced the Calatrava, inspired by the iconic Bauhaus style. Since then, it has become the cornerstone of their collection and proudly stands as their flagship model. This 18k yellow gold version pays tribute to Patek Philippes original design, featuring a Clous de Paris (or "hobnail") bezel that adds a refined and distinguished touch. The case is in excellent condition, showcasing a lovely oxidized color and a beautifully