If you've ever wondered why the rattrapante chronograph is considered one of the three complications required for a watch, in traditional watchmaking parlance, to be called a Grand Complication (along with the perpetual calendar and minute repeater), the complexity of the mechanism of the Tempo should go a long way in providing an explanation. The seconds hand and split-seconds hand are on the same axis in the center of the movement (and in the center of the dial). On the upper left, you can see the larger of the two column wheels, which controls start, stop, and reset under the influence of the pusher on the upper right. Lower left, you can see the column wheel that controls the split mechanism, and which opens and closes the pincers that both freeze the split hand and release it to catch up with the seconds hand. The pusher for the split mechanism is at the lower left. Technically speaking, the Tempo is a monopusher chronograph with a separate split button.