Well, some of the old ones are nearly perfectly spherical. But rather than use roundness as a first indicator, I'd say look first at what the glass itself is telling you about how it was manipulated -- for instance, you would be much more likely to get that internal tornado by hand-gathering, rather than by machine-making. Much more. Probably the closest you'd come with machine mades would be some of Akro's augers. And they used spinner cups.
And if that's a ground pontil I see in the left pic of the last pair of pics -- well, that takes it out of the realm of the machine-made right there.
So I hate to break it to you -- but I think you have a much better marble than you think you have!
(German; ground pontil; probably 1840-1860; unusual color.)