If it's against a wall, then it's leaning forward against the headstock. Reason: I never see an old neck bowed backward (away from the fretboard), so I always think to counter the string tension. (And it's true about the tuning pegs, too.)
If it is on a stand, then the neck support is lowered as far as I can get it for the same string tension reasons.
...so ever since then, I always hang on to the buckle.