A Technical Perspective: The Lange Datograph, Vacheron Constantin Harmony, And Patek Philippe 5170G

It sounds funny, but chronographs are really complicated complications. Getting lost in their wheels, levers and springs is easy. With everything going on in a chronograph, it is important to remember that they all have one thing in common: the intermediate chronograph wheel needs to engage with the center chronograph wheel smoothly for the mechanism to start reliably. For more, go to http://www.hodinkee.com/blog/patek-5170-vs-lange-datograph-vs-vacheron-harmony-review