The Jaeger Lecoultre 429 is a mechanical watch movement that features a pin-lever escapement. It is equipped with a ratchet on the dial side and a crown mechanism with a rocker bar. The movement incorporates a multi-purpose spring that serves functions such as setting mechanism, crown locking, and click. The Jaeger Lecoultre 429 movement is a manual wind movement with a sub second function. It was commonly used during the period approximately around 1960.