Dead-beat-seconds watches
References in the Grail Atlas catalog carrying the dead-beat-seconds complication.
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.
A seconds hand that advances in one clean step per second instead of sweeping, which costs amplitude, power reserve and parts to imitate what a cheap quartz movement gives away.
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