8N439756 / 8N439754 POP error

[bcmiller]

POP plate is stamped 124378N439756 but the POP book is punched 124378N439754.

I am looking for someone that knows how these were handled, after the main assembly process was finished at the factory and the car was readied for shipping. Is it more likely that the book was punched wrong or the POP plate was stamped wrong? 1968 is the only year that the books were punched like this.

Can not say I have personally seen this type of error before. Also note the tape for the name was installed upside down. The owner's name and address in tape was done at the dealership.
Also posted over on CRG.

Thanks in advance.