GS Jaeger-LeCoultre Moon Phase Master Series 1. The case diameter of 39mm .(Hot stamping moon phase, quick adjustment) 3. [Technical breakthrough] Using 9015 modified Jaeger-LeCoultre's self-produced Cal.925/1 movement, the functions are 100% synchronized with the original self-produced movement. The running time is stable and the quality is strong. 4. [Breakthrough in details] When observing the watch face from the side, it is found that there is a slight curvature. In order to achieve this effect, GS spent a lot of time and effort adjusting the mold many times to ensure that the charm and feel are comparable to the original ones. The Jaeger-LeCoultre Moon Phase Master will satisfy your needs. All the beautiful feelings of the moon phase.,