Ah Ha! A mystery is solved!
At least it's better than what I was told, and makes more sense than the notch in the bottom of buckhorn was for out to 75-100 yards, the top tips were for long range shots, and that one centered the front sight post in the middle of the "circle" formed by the horns in low light or moonlight for defensive use (like a ghost ring on a modern shotgun).
LD