The method of drive to the wheel carrying the seconds hand is very unusual as is the system of the stop/start assembly. The wheel is exceptionally thin (0.05 mm.) and has sixty ratchet or saw-shaped teeth with a controlling jump spring functioning every second. Between the underside of this wheel and the top of the pillar plate is an arm, operated via the case band, which is made to press on the underside of the wheel thereby arresting it; the wheel is so thin that it easily bends upwards when pressure is applied and returns back to its normal plane when pressure is removed.
A very unusual feature of the escape wheel is that directly beneath it is mounted a polished steel wheel having eight 'finger' teeth which engage in turn with the ratchet teeth of the wheel carrying the seconds hand.