Hello Frank,
I think you're right. Another thing pointing to a non- usa or uk manufacturer is the motor.
It looks original. After cleaning off some grime I have found it to be Italian.
I have been going through all Italian makes in the lathes.co.uk list, but no match so far.
My guess now is that some Italian company made this "anonymous" machine for import companys (like Groenewegen) so they could market them under their own name.