Patek Philippe has repeatedly broken the boundaries of horological art and added a powerful timekeeping function to this timepiece: a split-seconds chronograph device. This device is extraordinary, and it is as famous as the minute repeater and the tourbillon device, which can be called the three complex timepiece functions that are difficult to perfect. It emphasizes a fairly sophisticated operating system, which is used to control the second central chronograph second hand, stop it to measure the middle period of time (or store a reference time), and then let it go back to another big three hand in an instant. Those overlapping as one, continuous operation. The reference 5308 watch is sincerely designed for those who love beautiful devices. It combines four complex functions, such as the minute repeater and the instantaneous perpetual calendar, which have long been classified as top-level complex functions.