An excellent representation of the brand’s adventurous pioneering spirit, the OMEGA Speedmaster Moonwatch Professional Chronograph Men\'s Watch has been a part of all six lunar missions, making the Speedmaster the world’s most famous chronograph. At A Glance  Black dial with chronograph sub dials Black bezel with tachymetric scale Baton hour markers 42mm case size with 50m water resistance Presented on a black leather strap Fold over clasp fastening Scratch resistant sapphire crystal glass Powered by the manual-winding OMEGA Calibre 1863 movement, worn on the moon 48 hours power reserve