Dead-beat seconds

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Arnold & Son DSTB White Gold
Here the dead-beat second and the associated mechanism are prominently displayed via a large sapphire sub-dial on the upper left side of the dial
© Arnold & Son

Dead-beat seconds (or jumping second, true beat, French: Seconde Morte, German: Ruhende Sekunde) are a special function of mechanical watches.

Here the seconds hand moves stepwise and exactly in a strict seconds rhythm. This mechanism is found, for example, with these models: