The Omega 3861 Lunar Interwatch Gold 310.20.42.50.02.001 The 42 mm case diameter is matched with a stepped dial with solar ray polishing effect. It has a small dial and hour scale that has been blackened, presenting a unique visual impact. The black ceramic bezel is decorated with a speed measuring scale made of OMEGA Ceragold technology and is equipped with the iconic "Dot over 90" mark of early Speedmaster models. The 3861 Zhizheng Observatory movement carried inside has high precision and anti-magnetic capabilities. It also has an amazing movement polishing process. It combines luxury and precision with its unique design and excellent performance, making it a timepiece for watch collectors and space fans.