Omega Speedmaster ST 145.022

Omega. A rare stainless steel water-resistant chronograph wristwatch with decimetre scale and bracelet Signed Omega, Speedmaster Professional, ref. ST 145.022, movement no. 31'615'196, manufactured in 1973 Cal. 861 copper-finished lever movement, 17 jewels, metal dust cap, the black dial with luminous baton numerals, luminous baton hands, three engine-turned subsidiary dials indicating constant seconds, 30 minutes and 12 hours registers, in large tonneau-shaped water-resistant-type case with downturned fluted lugs, black bezel calibrated for decimal scale, the screw back with engraved inlaid black enamel inscription FLIGHT-QUALIFIED BY NASA FOR ALL MANNED SPACE MISSIONS - THE FIRST WATCH WORN ON THE MOON , two round chronograph buttons in the band, stainless steel Omega link, the clasp stamped 4.71 and ref. 1039, case, dial and movement signed 42 mm. diam.