Omega. A fine and very rare stainless steel chronograph pre-series prototype wristwatch with day, date and bracelet Signed Omega, Speedmaster, Automatic, pre-series prototype model, no. 3, case Ref. 11000, circa 1974 Movement: cal. 1045, automatic, 17 jewels, hand engraving “3” near balance, signed Dial: signed Case: screw back punched with reference 11000 on the inside, hand engraving “3” underneath upper left lug, day, date and time adjustment crown, 39 mm. wide, 44 mm. overall length With: stainless steel Omega bracelet, endlinks stamped 175, deployant clasp stamped 1171, overall length approx. 190 mm.