Classical and refined, the Jaeger-LeCoultre Master Ultra Thin features a 39mm 18ct pink gold case which houses the mechanical automatic movement, Jaeger-LeCoultre Calibre 925, crafted, assembled and decorated by hand, with a moon phase and 43 hours power reserve. True to its name, the case is only 4.9mm thick. The beige dial is beautifully decorated by the moon phase indicator.