This is a rare 1980s midsize IWC Ingenieur 3506-1 in steel and gold, featuring the sought after black „millimeter-pattern-dial“. The 34mm Gerald Genta designed Ingenieur „SL“ has a fat case and still all it´s original parts. Dial and handset, with original Tritium, appear in flawless condition. The IWC automatic caliber 37531 is running strong and exact and is not in the need for a service soon. The IWC comes on the beautiful flexible steel-endlinks which are connected to a new black lizzard leatherband that fits perfectly to the pattern on the dial.