With a nice original 70ies item, which I haven't seen since many years any more These magnetic chunks with numbers, which were used by garages for the sequence of the cars. When I had been with my father to the big VW-garage, I was always were keen to put them on the roof by myself. But I could do this only two times - util my father made the experience, to be cheated and stolen from by them After that he went to a small garage, where the owner has known the customers and the cars personally. So he needed no magnetic numbers.