IWC Ingenieur 666 AD

IWC. A fine and rare stainless steel self-winding water-resistant anti-magnetic wristwatch with sweep centre seconds and date Signed International Watch Co., Schaffhausen, Ingenieur, ref. 666AD, movement no. 1358827, case no. 1469022, circa 1958 Cal. 8521 nickel-finished lever movement, 21 jewels, anti-magnetic soft iron core, the silvered matte dial with applied dagger numerals with luminous accents, luminous dauphine hands, sweep centre seconds, magnified window for date, in large circular water-resistant-type case with screw back, later crown, downturned lugs, case, dial and movement signed 36 mm. diam.