Master Ultra Thin Moon by Jaeger-LeCoultre, an upgraded version of the starry sky and moon, features a 39mm case with a simple line design and an aesthetically pleasing dial. The display brings vitality to the dial, with six date display hands paired with the starry sky moon phase, resembling a harmonious and wonderful ballet on the wrist. Through the transparent case back, the movement's operation is clearly visible. This ultra-thin movement, with a thickness of only 10mm, proves to the world that extraordinary craftsmanship and complex functions can be perfectly showcased within a compact space.