IWC INGENIEUR REF. 666AD.International Watch Co., Schaffhausen, Ingenieur, Ref. 666AD, case No. 1438807..Made circa 1955..Unusual and rare, water-resistant, center seconds, anti-magnetic, self-winding 18k.yellow gold wristwatch with Pellaton system, date
C..Three-body, polished and brushed, antimagnetic cap to protect the movement.against magnetic fi elds, screwed-down case-back, fl at bezel, concave lugs..D..Silver with applied gold Arabic and dart indexes, outer minute division, date.aperture. Luminous gold dauphine hands..M..Cal. 8521, rhodium-plated, fausses cotes decoration, 21 jewels, straight-line lever.escapement, monometallic balance, shock absorber, self-compensating blued steel.Breguet balance spring, micrometer regulator, hacking seconds..Dial, case and movement signed. Diam. 36 mm. Thickness 13 mm. Approx. overall.length 180 mm.