The manufacture launched its first regularly produced World Time Chronograph in 2016. Previously, only one exemplar of this type of watch existed. The new Ref. 5930G combines a self-winding flyback chronograph with Patek Philippe’s patented World Time mechanism in one of the thinnest and most elegant wristwatches in this category. Philip Barat, director of development at Patek Philippe, discusses its key features and the challenges involved in its making.