Fender tag date code.

Peter L said

Thanks. That code on my fender tag is A23. So does the 'A' mean first month of production, 23rd day?

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No.
It denotes the scheduled production date of your car as October 23rd, 1968.
Since October is the 10th month of the year, Chrysler used the letter A as the prefix and the 23 is the day scheduled.
November would be ''B'', and December would be ''C''.
Then in January, it would start as a single digit again so the scheduled build date would be 123.
They only wanted 3 digits for the scheduled build date, so that is why they went to A,B, and C for the last 3 months of the year...