As I understand, the plate is put on by body builders beside Ford. The Ford made bodies do not have the tag. I believe most of the 5-W Coupe bodies were made by Ford in 34, the Cabriolet bodies as well as the other open cars were not. The model number as well as the sequential body number for the non-Ford plant appear. This is kind of the simple answer since other numbers often appear, and the numbers are different in Canada.