Build date i formation help

When I ran the fender tag on my son's 73 Dart Sport, part of it told us what day the car was built. Does 70 not have the same codes on the fender tag? If so, run it thru a decoder.
That’s what I’m trying to figure out with other parts on the car the car doesn't have a fender tag it was lost years ago when it was stripped to rebuild, i am having one remade so trying to be as accurate as possible based on the numbers matching parts on the car.