Now Master Chronometer Certified with the highest standard of precision, performance and magnetic-resistance in the Swiss watch industry, the OMEGA Speedmaster Moonwatch Professional Co-Axial Master Chronometer Chronograph Men\'s Watch is one of the world\'s most iconic timepieces, known for it\'s part in all the six moon landings. At A Glance  Presented on a brushed five-arched-links-per-row bracelet with polished clasp and OMEGA logo on a satin-finished cover 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 Sapphire crystal glass on the front and on the clear case back Powered by the OMEGA Co-Axial Master Chronometer Calibre 3861 movement Anti-magnetic to 15,000 gauss Power reserve of 50 hours