Omega Speedmaster Series 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 a blackened small dial and hour markers, presenting a unique style. With great visual impact, the black ceramic bezel is decorated with a tachymeter scale made of OMEGA Ceragold technology, and is equipped with the iconic "Dot over 90" mark of early Speedmaster watches. The 3861 Master Chronometer movement is equipped inside, with high A multi-functional mechanical watch with impressive movement polishing technology and stunning precision and anti-magnetic capabilities,