Dead-beat-seconds watches

A dead-beat seconds (also called "true-beat" or "seconde morte") advances the seconds hand in one-second jumps rather than a continuous sweep, despite a mechanical movement underneath. The look is quartz, the mechanism is mechanical. Reference points include the Jaeger-LeCoultre Geophysic True Second, the Habring² Erwin, and certain F.P. Journe pieces. The complication is an internal complexity worn quietly — most observers will not know what they are looking at, which is the point.