C. Three-body, solid, polished and brushed, rotating black bezel for the decompression times, downturned lugs, screw-down back with Seamaster 120 logo. D. Black with painted luminous baton indexes and applied steel baton indexes for the quarter hours, outer minute/seconds divisions, applied Omega symbol. Luminous steel baton hands. M. Cal. 630, copper-colored, 17 jewels, straight-line lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring, index regulator. Dial, case and movement signed. Diam. 31 mm. Thickness 10 mm.