This is a 1980s IWC Ingenieur 3506 sl, with beautiful grey „millimeter-pattern-dial“, in outstanding good condition. The 3506, with it´s 34mm steelcase, was the first version of the midsize Ingenieur after the release of the iconic Gerald Genta designed Ingenieur 1832 Jumbo, and the only execution of the midsize Ingenieurs that writes the letters „SL“ on the dial. it appears to be in very sharp condition with all parts like crown, glas and bracelet being the original ones. The serialnumber on it´s caseback is clearly readable. the golden indicies and handset with beautifully toned lume looks just awesome on that grey dial. It´s IWC automatic caliber 3753, with 21 carat gold-rotor, has recently been serviced by the former owner. The watch will fit wrists up to a circumference of 18,5 cm or smaller.