This question is solved.
I was at the Mercedes dealer this morning and 1 of the older mechanics recognized the wheels. They are a custom set deriving from the Enkei EK96 and are extreme rare as these set of wheels were 16x8 and 16x9 with a very low backspacing and where never sold to the general public as they are a limit option for the Mercedes Sec and AMG models in the '80's. .
For the public the EK96 was only sold as 15x7 and 16x8 in very low numbers as these wheels are $$$$. A cheaper option for the same style wheel was the Remotec or BBS wheels.
If you found or have a wheel(s) that unknown maybe this treat could help. Just post a picture of your wheels.