Jaeger-LeCoultre 854

The Jaeger-LeCoultre caliber 854 is an in-house automatic movement introduced in 1998. It serves as the base caliber for the Master collection and forms the foundation for moonphase complications. The movement belongs to Jaeger-LeCoultre's 8xx family of manufacture calibers, representing the manufacture's commitment to vertical integration. It remains in production and is used in various Master collection references featuring moonphase displays.