Month of manufacter for the door vin

Even if you had the fender tag & broadcast sheet, there is no way to know the actual build day. The cars were not built in VIN order, occasionally cars close to 30,000 VINs apart were built very close together.

The date on the fender tag & broadcast sheet is the date they hoped to build the car when it was first entered into the system.

The Mylar door stickers were one of the very last things added to the cars before they were driven off the assembly line & per Federal law, they HAD to indicate the actual build month & year. Newer cars, starting late in the 1972 model year (if I remember right) had to use a MDH (Month, Day, Hour) code instead of just the month & year.