Mecaquartz emerged in the 1980s as a way to combine the cost and accuracy of quartz with the user-experience of a mechanical chronograph. The architecture: a standard quartz module powers the hour and minute hands at 32,768 Hz; a separate mechanical chronograph module stacked on top uses traditional column-wheel or cam-and-lever actuation, with the chronograph seconds hand driven mechanically (giving smooth sweep) but reset and engagement controlled electronically.
The dominant supplier is Seiko with the VK63 and VK64 calibres. These are used by Tudor Tiger Woods (some references), microbrand chronographs (Dan Henry, Helson, microbrands at the CHF 200-800 tier), and even modified Tudor Black Bay Chrono dial-trains (rare). The compromise: full mechanical accuracy benefits don't apply (the quartz timing is the regulator), and the hybrid feel is recognisable to enthusiasts as 'not a real mechanical chronograph'. But the user experience is dramatically closer to mechanical than pure quartz, at a fraction of the price.
