You are probably right. I had a deeper look in my archive and found a drawing of the Rivo. The propeller is only slightly tilted, but the bodywork is different, without the top, but with horizontal fenders and a more ship-like front. And furthermore, the puzzle car has a Berlin registration, while the Rivo was built in Schwäbisch Gmünd. Too bad, Oldtimer Markt is usually a reliable source. I'm rather doubtful about Adele either.
Great additions, BTW. Never seen it from the back before.
What to do now? I think, Majeko can keep his point, as he found two possible names.
Could an editor please move this topic back to the professional board.