Voadam
Legend
The Moldvay B/X Basic Set came out in 1981, 1e AD&D came out in the late 70s.B/X is, well, older than BECMI and AD&D. What could be more Old School than that?
The White Box, I suppose. But there was a reason D&D moved past that version of the game rather quickly!
You might be thinking of the Holmes Basic set which was a transition point between OD&D and 1e AD&D and was sort of a hybrid of the two (five point alignment which showed up in the 1e Monster Manual).