It's on the fender tag. In the line above the VIN. It is 3 digits. Usually 3 numbers, the first is the month, the second two numbers are the day. For the months of October, November and December the month is represented by a letter, A, B, and C respectively. Also, the VIN sticker on your door has your month and year of manufacture.
Thanks Shake.. I think I should have said its a 67 coronet.. because on mine ( where you have it circled) it says WW1, which I believe is the color.. any thoughts?? help