IWC Ingenieur SL reference 3505 gents wristwatch in steel, Switzerland according to original papers sold September 1983, self winding, satin-finished case with integrated stainless steel bracelet, screwed-down case back & winding crown, gold plated soft iron- inner case, gray dial, raised gilded indices, date at 3, original hands, rhodium plated movement calibre 375, precision adjustment, IWC-service receipt from 2005 enclosed, diameter approx. 34 mm, length approx. 19 cm, condition 2, property of a collector