Jaeger LeCoultre, Master, Model: Q1548420, Automatic mechanical, stainless steel 39MM. Equipped with Jaeger-lecoultre's self-produced 899 / 1 movement (some versions are 8991), it is automatically wound, with a power reserve of approximately 43 hours. It has passed Jaeger-lecoultre's 1000-hour movement test and has excellent stability. The back of the watch features a transparent design, allowing one to appreciate the polishing of the movement and the rotor. It is water-resistant to 50 meters, meeting the needs of daily wear.