Interesting!
It certainly looks a good machine.
No Steinel name on Tony Griffith's site index, for any machine-tool, so it must be rare! It may still be worth contacting him if you've not already done so. He may have something about Steinel, and if not would certainly be interested to learn of yours.
It might be a "badge" name – I identified the large lathe I used to own ( and subsequently donated to Lynton & Barnstaple Railway's workshops) as a German-made Ehrlich machine despite a riveted-on brass plate saying " IXL ".
I like the workshop paper-weight (on the floor)!