Thanks, Bill. The look of the car jogged my memory, and I went (as I usually do with these quizzes) to my bookshelves and found the car in a reference book on metal toys. I guess I should have then googled Blomer & Schuler, which I just now got around to doing . . . And a bit down the page, there was the green car you spoke of, propeller and all, and the illustration Grob used is in fact the box top for the toy.
Note: Some of the written material calls this toy an "aeromobile"' but I don't know if that was an actual Blomer & Schuler designation, or if it appeared on the toy or the box. Just thought I would mention it in case it is considered part of the complete answer.
Further Note: If you google "Blomer & Schuler aeromobile", you will find that (A) This toy was made in a couple different versions, (B) There were at least two different boxes, and (C) The name "Aeromobile" does, in fact, appear on the later series box top which is said to be from 1952.