To me, the base glass doesn't look right for Vitro - too many bubbles, and overall, it looks sort of like boiling water, with bubbles of a various sizes, which is a trait I usually associate with Akro. And in the upper left marble (third image) it looks like the patch is trying to dip into the matrix along a seam, a trait I also usually associate with Akro but have seen on some oddball Vitros too. Here's an Akro pic that sort of shows that trait. In addition, because of their sloppiness, I am thinking the OP marbles may be dug.