IWC Ingenieur International Watch Co., Schaffhausen, 'Ingenieur,' Ref.866 A. No. 1921932, case No. 1813377. Made in the late 1960s. Unusual, water-resistant, center seconds, anti-magnetic, self-winding with 'Pellaton' system, stainless steel wristwatch ...
IWC Ingenieur 866 AD silbernes SIGMA Zifferblatt for $9,073 for sale from a Private Seller on Chrono24
The IWC Ingenieur - Dial Variations in Vintage Models: Part 3