I have to agree to both of you, 'knewit' and 'nicanary', that the Zimmermann Hansa FJ is the same as the puzzle car, so both of you will be awarded with one point. 'knewit', as he was first to solve the puzzle. 'nicanary', as he was persistent enough to repeat 'knewit's' answer again with a picture proof, even though I had already called it wrong, and forced me to investigate further.
My source designates another name and builder for the car. I attach the proof about it, as this photo-studio named it 'MH-Formula Junior'. The builder should be Manfred Herbster. At first, I thought, that could be right, if Mr. Herbster sold the project to Mr. Zimmermann and Mr. Zimmermann raced the car named 'Zimmermann Hansa Formula Junior'.
I stopped thinking about this opportunity, as soon as my son zoomed the original picture of the puzzle car and told me, that there is a script 'Zimmermann' to find at the front bonnet.
Sorry about that mistake and some misunderstandings.
May be there has been any Herbster-Zimmermann-connection with this car, I don't know about. If somebody knows more, she/he will be invited to to share this knowledge with us
