The Mark II is a reissue of the original 1969 model, which contained the Caliber 861, the hand-wound movement used in the Omega watches that accompanied astronauts to the moon in 1965. The new Mark II, to be introduced at Baselworld next month, has been updated with an automatic movement and a prominent tachymeter scale that is illuminated from beneath by an aluminum ring filled with Super-LumiNova. Fluorescent orange accents – central chronograph seconds hand, minute track, 30-minute counter hand and hour totalizer hand at 6 o’clock – stand out against the grey dial. The brushed stainless-steel bracelet features Omega’s patented extendable foldover rack-and-pusher clasp. The watch comes with a special tool to adjust the date display, which is done at 10 o’clock on the case side. It contains the Omega Co-Axial caliber 3330, a self-winding movement equipped with an Si14 silicon balance spring and a column-wheel chronograph mechanism.