Tape Steel Band Omega 3861 Moon Watch Gold Model. 20.42.50.02.001 The 42mm case diameter is matched with a stepped dial with a solar ray polished effect. It is equipped with blackened small dials and hour markers, presenting a unique vision. The impactful, black ceramic bezel is decorated with a tachymeter scale made of OMEGA Ceragold technology, and has the iconic "Dot over 90" mark of the early Speedmaster models. The 3861 Master Chronometer movement is equipped inside, with high precision. And anti-magnetic capabilities, it also has an amazing movement polishing process. Its unique design and excellent performance combine luxury and precision, making it a dream timepiece for watch collectors and space fans.