Jumping Seconds also called ‘Dead Beat Seconds’or ‘Seconde Morte’ is a quite rare complication. It makes a mechanical watch tick like a quartz watch.
The second hand of a mechanical watch with dead beat seconds complication, progresses like a quartz watch. The seconds hand sits on a seconds mark for one second and then jumps instantaneously to the next seconds mark, exactly like a quartz watch.
Habring² Jumping Second
Gronefeld One Hertz
ChronoSwiss Sauterelle No.258
Audemars Piguet Millenary Dead Beat Seconds
F.P.Journe Remontoir d'Egalite avec Seconde Morte