OMEGA Memomatic, Ref. ST166.0072 (166.072), movement no. 30015734, circa 1970 A fine and attractive, tonneau-shaped, automatic, stainless steel wristwatch with two-tone dial, gray and black, luminous hands, sweep center second and alarm, rimmed date, stainless steel Omega bracelet with deployant clasp. Fitted with a Cal. 980, copper finish, self-winding, 19 jewels, screwed case back, corrector in the band, hesalite crystal. Dial, case and movement signed. Dim. 40 x 44 mm. Thickness 15.30 mm. Approx. overall length for bracelet 190 mm. The Omega Memomatic Ref. ST166.072 was introduced in 1969. It holds the distinction of being the first automatic wristwatch with an alarm function that allowed the alarm to be set precisely to the minute using a single barrel for both timekeeping and the alarm mechanism.