Alarm watches
References in the Grail Atlas catalog carrying the alarm complication.
Mechanical alarm watches are rare and historically tied to two references: the Jaeger-LeCoultre Memovox (1950s-present) and the Vulcain Cricket (worn by US presidents from Truman to Johnson). Modern Memovox automatic references use a separate barrel and crown for the alarm function. The complication is more interesting than useful, the buzzer is loud enough to startle but not to wake.
A mechanical alarm complication adds a second independent mainspring and strike train that triggers a hammer against a gong or caseback at a preset time.
How the alarm works: history, mechanism, parts required, and what makes it hard to build →
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