8N439756 / 8N439754 POP error
 

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.

Wow not even one response?

Don't feel bad I asked a similar question a few weeks ago,
same response 0!!

Yes the R for carb on that L72 POP is an error. Errors like that on POPs are fairly rare.

I am researching the issue for you now. Please be patient.

Ok thank you.

never seen a pop that way, but have seen plenty of engine blocks off a digit or so.

Hopefully we find answers.

I promised OP that I would make an effort to track down the people who worked the activity in question and I took a considerable amount of time and effort to reach an informed conclusion.

Several workers were consulted including Key punch operators and floor supervision.

Everything started with the critical key punch action completed on a stack of IBM cards for each separate automobile produced.



Skip to 5:20 to get to basic information as to how GM used this technology to build cars in the late 1960's. Below is an actual IBM punch card used at GM Norwood.

For 1968 GM decided to use the brand new IBM Keypunch- Punched Card Typography technology to add a VIN sequence to the outer portion of the warranty booklet corresponding with the VIN on the Metal Protecto-Plate. Below is the code key used.