Case: Two-body, polished and brushed, screw-down case back engraved with Seamaster logo, overlapping hooded lugs.Dial: Bicolor blue and silver with steel baton indexes and luminous dots, inner Arabic five minute markers, outer 1/5th seconds scale, outermost tachometer scale graduated to 500 units per hour, subsidiary dials for the constant seconds and the 12-hour register, the 24 hours with night/day indication by means of an arrow on a revolving disc, 60-minute register by means of a orange central jet hand, aperture for the date. Luminous white baton hands.Movement: Cal 1040, copper-colored, 22 jewels, straight-line lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring. Dial, case and movement signed. Dim 42 x 49mm.  Thickness 16 mmDial, case and movement in good conditionNOTE: This reference was launched in 1972.