With automatic movement, the OMEGA Co-Axial Master Chronometer men's watch incorporates a 3861 caliber that activates the small seconds subdial and counters. The case of this Moonwatch features a 42 mm size in 18 Ct Sedna gold, sapphire crystal and black chamfered dial with the iconic circle on the 90 of the bezel ring in anodized aluminum. With a beautiful black leather strap, this Speedmaster watch features a folding clasp buckle and is water-resistant to 5 bar.