"Seamaster Automatic " Omega, "Seamaster Automatic ", Ref. 176.007. Made in the 1970s. Fine, tonneau-shaped, self-winding, water-resistant, stainless steel diver's wristwatch with round button chronograph, registers, date, 24-hour night/day indication and tachometer. Accompanied by a fitted box and certificate. Two-body, polished and brushed, screwed-down case back with logo. Bi-color midnight blue and white withtritium-coated indexes, subsidiary dials for the seconds and the 12-hour registers, the 24 hours with night/dayindication by arrow on an under disc, 60-minute register by orange cross-shaped central hand, aperture for thedate, outer tachometer graduation. Tritium-coated white "bâton" hands. 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. 38 x 42 mm. Thickness: 15 mm.