So, what exactly is going on here? If you look at the watch from the back, with the crown on the left, you'll see the stop-seconds and deadbeat mechanism swoop over the otherwise-normal-looking three-quarter plate from the top left, where the pusher is located, down to the bottom and back up to the top right, where there is a wheel and spring just next to the balance cock. Starting on the left, there is a large pawl connecting the pusher to the column wheel at the lower left. When activated, that pawl turns the column wheel, which in turn either starts or stops the seconds hand. It works very much like the start/stop mechanism in a chronograph.