Actually, not all Model A vehicles even had a frame number. It is popularly but incorrectly claimed that the serial number of the vehicle was a frame number. The Specifications and License Data page above in the Instruction Book is quite clear and specific about this. Model A Vehicle Serial Number and LocationĪs shown above in the 1928 Model A Ford Instruction Book, Ford did in fact specify the engine number to be the 'serial number' of the vehicle, during the Model A (and B) era, and throughout the 1930's.