Sales codes for 1970

[nes4pres]

I am viewing a fender tag, WM23 N0A. I believe this to be Coronet, medium (Superbee), two door, 383, 1970 in the Lynch Road plant.

The second line codes at the TOP of the fender tag are 083 051 663. I am told these are historical sales codes before 1970.

Does anyone know what they decode too?

 

[R413]

083 engine 051 rear axle 663 trans

(663 is really 668 on the tag for automatic 383-4bbl)