A Stainless Steel Ref. 3572.50 Speedmaster Professional Wristwatch, Omega, 42.50 mm case diameter, matte black dial signed OMEGA, luminous baton numerals, subdials at 3, 6 and 9 o'clock for chronograph minutes, chronograph hours, and seconds respectively, luminous index hands with center sweep chronograph seconds hand, hesalite crystal, black enamel tachometer bezel calibrated to 500 units, polished and brushed tonneau case with knife edge lugs, chronograph pushers at 2 and 4 o'clock in the outer band, screw on exhibition back with sapphire crystal, Cal. 1863 manual wind 18 jewel rhodium plated movement with fausses ctes finish signed OMEGA, alternating brushed and polished link bracelet, deployant clasp with push-button closure.Accompanied by the inner case, outer box, and two booklets, all signed OMEGA, together with three additional bracelet links.