Four years after the polarizing release of the Patek Philippe Travel Time ref. 5524G, the brand has decided to dive into the grand complication waters with the Travel Time model and has now unveiled for Baselworld 2019 a grand complication that adds a 24-hour alarm mechanism while displaying the time to which the alarm is set on a double aperture in a digital manner. The alarm signal is struck by a hammer on a classic gong and to make this possible, Patek has developed a totally new integrated movement with four patent applications filed for the alarm mechanism. The new Patek Philippe Alarm Travel Time ref. 5520P is the result of five years of research and development.