How about this
Give power to the correct shaped an placed quartz crystal and it will vibrate at 32,768 Hz, the IC (Integrated circut) counts the vibrations and every 32,768 Hz turns the power on and off, that makes the motor turn a half turn and the second hand step forward one second.
General quartz movement s have steps of 1 second but many watches that do not have a second hand (mainly Ladys watches) have 6 or 20 second steps, this saves a lot of power and extends battery life.
So all it is is a switch that turns the power off and on making the motor turn, simple as that.