The ref. 666, the ref. 866 (special version: believed to have been a "military dial" prototype), the ref. 1832 "Jumbo" and the ref. 3508 (special version: 500'000 A/m). Cheers, HSTE
The "1832" in its name references the first Ingenieur SL (Ref. 1832) from 1976 , which was itself a tribute to the 1955 Ingenieur (Ref. 666) , IWC's first anti-magnetic watch. From the interwebs.
It is powered by the IWC calibre 8521 and the bracelet is the IWC ref. 11. This one is (should I dare to say: "as usual") in near mint to mint condition. Cheers to vintage! HSTE
In the playfield of amagnetic watches, the IWC Ingénieur ref 666 certainly is a must have. From 1958: With love. A later one.... This one is our dear friend Tyler's. Best, Nicolas