1973 duster door tag sticker

"AdamR", Your MDH code is 022813. The sticker was printed and most likely placed on the car on Feb 28th. The car was built 8 days later then what is on the fender tag.

What is the SPD of your car "beerboy"? If it is in the middle of the month, you are probably safe in assuming the car was built in that month.