Technically, it requires not one but two column-wheels and much more levers and parts on the back of the movement, including a pair of clamps to stop only one of the two hands a series of features that are so complex that they hide almost all the back of the movement, making the main plate, the fusee-and-chain or the tourbillon almost invisible. replica rolex watches No complaints either, as the rattrapante chronograph mechanism is superb, with a complex tangle of levers, springs, wheels, brakes, clamps and column-wheels and of course, all these parts are decorated with the highest level of details.