Doubt it was from a later 4000. Single-pickup 4000's from mid 1972 onward were set-neck and would have the darker shedua strip down the middle of the neck (and headstock), but not in the body as it was not "neck through." Don't know the origins of this one. It would be interesting to know if this one has the thick body like the originals. They were approximately 1 5/8" (41mm) thick. Sometime in 1961 they reduced the weight by making the body thinner – to about 1 1/4" (31mm) , but that affected the balance, necessitating the increased length of the upper body horn to move the strap pin "up neck" to reduce neck dive.
