The eyes are where the marbles touched one another when they were bulk loaded into the kiln. As I understand it, the reason the eyes sometimes have spacing that resembles a stand is just because of the way the marbles would stack. Imagine a four marble pyramid, the top marble would wind up with three eyes where it contacted the marbles below it, and this would be a common arrangement in bulk-loaded marbles. But the number and position of the eyes (touch marks) is dependent on where in the batch the marble was, on the top, bottom, middle or outer edge of the batch. (Look at marbles "stacked" in a jar - the eyes on one marble would be found where it was contacted by those surrounding it. There were also different types of stands. The type like you showed and another later type that were more pointed and left smaller marks - like the OP marble IMO.