Bundeswehr 1550 SG — Sinn-Branded

Valjoux 230

Manual-wind column-wheelColumn wheelA chronograph control system that coordinates the operating levers; a cam system is an alternative construction. flyback chronographFlyback chronographA chronograph whose reset pusher can be pressed during timing to return the hands to zero. A new measurement begins when the pusher is released, without a separate stop operation. with hacking secondsStop-secondsA time-setting function that stops the running seconds when the crown is pulled, commonly by arresting the balance in a mechanical watch. It allows synchronisation with a reference time signal. Also called hacking seconds; stopping does not itself return the hand to zero., 18,000 vph and 48 hours’ reserve; of the Heuer Bundeswehr 1550 SG.