In a nut shell, each punch represents the number to the far right for the column it is in.
The first 8 punches are 32704016 aka the shipping order number.
First digit is scheduled production month (3)
Next 2 are day (27)
Next 5 are seq number (04016)
On your trunk rail you should find
7232704016 stamped in.
7 is year
2 is Hamtramic plant
The reast is as above.
In a nut shell, each punch represents the number to the far right for the column it is in.
The first 8 punches are 32704016 aka the shipping order number.