Looks like FF4 Light Green Metallic originally with the brighter green being a later repaint and almost completely peeled off
An original door sticker is the most accurate way to tell the actual build date- the label was printed and attached as the car was being completed in the factory- the scheduled build date as found on the fender tag can often be off quite a bit depending on vehicle and the VIN/ sequence number was assigned before the car was actually started to be built- the cars coming off the line wouldn't necessarily be built in the same order as the numbers assigned
Was saying that it may have been used as a parts car then abandoned and the VIN switched to a cleaner but more common base model Challenger
Some of the Mopar boards keep track of VINs from known wrecks beyond repair and the occasional VIN plate/fender tag/and title that shows up for sale- on more than one occasion a nicely "restored" car later comes up for sale with that VIN
The VIN in the photo is for a Challenger R/T originally equipped with a high performance 383- the standard engine for the R/T model
"JS" designates R/T, "JH" would be a base model, "23" a hardtop ("29" would be an SE), "N" for 1970 the 383 4 barrel, "0" the model year, 1970, and "E" the assembly plant
The VIN number and scheduled build date were assigned to each vehicle in advance but the door sticker was applied at the end of the assembly line and accurate in determining when a particular vehicle was built.
Normal model year changeover was usually around early July with the plant shutting down for a couple weeks for the switch before actual regular production so a September built Challenger would be a fairly early example