Patek Philippe Ref. 5520P Alarm Travel Time

Patek Philippe is unveiling a new self-winding grand complication that adds a 24-hour alarm to its exclusive Travel Time display with two time zones; the alarm signal is struck by a hammer on a classic gong To achieve this, the manufacture created a totally new integrated movement Four patent applications were filed for the alarm mechanism.

The new caliber is presented in an elegant platinum case that reflects the Pilot Travel Time design. . Source