Jaeger-LeCoultre 938-1

Jaeger-LeCoultre's Caliber 938 is an in-house automatic movement with a power reserve indicator and date complication. It operates at 21,600 vph with 19 jewels and provides approximately 48 hours of power reserve. The movement features Incabloc shock protection and instantaneous date change. It remains in production and is used in the Master Ultra Thin Réserve de Marche collection.