The shadow project "Schwarze Witwe" (Black Widow), kinda stealthy developed by Opel engineers.
A bit like the C2 GS, to undermine GM's "no racing" doctrine in the 60s.
Mythical over here, a bit like the AMG SEL, as the original disappeared, too.
Some seriously famous names involved in engineering, design and driving.
Erich Bitter (of Bitter CD fame), Niki Lauda (you probably heard of him) and Anatole Lapine (Porsche transaxle cars).