The date on the body tag is when Fisher Body released the build order, not necessarily when the car was final-assembled. 06A at Norwood is the entire month and spans VINs N652xxx-N665xxx. There is overlap at the beginning and end of the month. The first few days of June cars with 05E tags were built; the first few days of July the last 06A tags were built.
A car with an 06A tag and a later VIN could have been built with a June VR.