In a book about Willi Martini I found several pictures and details about the Loof-BMW. It is definitely the same car which was altered several times. The front shown in the GG-75 puzzle is the older one. In the mentioned book there was a picture of this car at a very early stage with the long scooped hood, but without bumpers, a different windshield and wipers mounted at the top of it. Next development stage would be the GG-75 car, already with a new windshield, bottom-mounted wipers and bumpers. Last stage is the car in this puzzle with the shortened scoop. In this specification it was presented at the Bad Neuenahr concours d'elegance and in the brochure.