One of the world\'s most iconic timepieces, this OMEGA Speedmaster Moonwatch Professional 18ct Sedna Gold Co-Axial Master Chronometer Chronograph Men\'s Watch has been a part of all six moon landings, and is an impressive representation of the brand’s adventurous pioneering spirit. At A Glance  Presented on an 18ct Sedna gold five-arched-links-per-row bracelet 42mm case size with 50m water resistance Asymmetrical case, black step dial and the famous dot over 90 on the anodised aluminium bezel ring Small seconds sub-dial, 30-minute recorder and 12-hour recorder, along with the central chronograph function Domed scratch‑resistant sapphire crystal with anti‑reflective treatment on both sides Screw in crown Anti-magnetic Powered by the Master Chronometer certified OMEGA Co-Axial Master Chronometer Calibre 3861 movement Power reserve of 50 hours