The Patek Philippe Ref. 5370 Double-Chuck Chronograph is a chronograph solely devoted to measuring short-duration activities and a super complex watch of Patek Philippe , at a price of nearly 3 million yuan. The two-second chasing chronograph has a long history in Patek Philippe : the first watch made by Patek Philippe in 1923 had such a complex function. The two-second chasing needle timing function measures the time between two moving objects without affecting the current timing activity. From the date of birth, this complex watch has always been part of Patek Philippe 's mass production watch. In 2009, Patek Philippe introduced a patented chronograph movement, which was successfully launched in just three years. Originally, this feature was superimposed on a watch with a calendar device and as a single feature on the Ref. 5370 watch. CaliberCHR 29-535 PS movement a total of 312 parts, this manual winding movement with two spider wheels and a horizontal clutch, classic. Seven exclusive patented innovative inventions can be said to be unique, each dedicated to improving travel accuracy, ease of adjustment, improve reliability and ensure accurate display. These innovations include a transmission wheel gear shape that increases efficiency and reduces wear and tear, the separation of the chisel-chronograph second hand and the movement of the chronograph in a one-turn chronograph, mechanical devices that precisely align the chronograph second hand and the chaser needle, and more. In short, the current fake 5370 even imitate some of the appearance, but the movement is far worse, as long as the watch has seen the real movement, not difficult to identify a fake watch at a glance.