This is an interesting thread.
In the ad; the drawing looks like the marble is clear with 2 colors swirling etc.
The darker of the two could be AV. My clear and opaque marbles with AV have rainbow colors in them, in the AV, as do most, if not a single color AV.
I see that there were or are two versions of the 5&10 boxes noted above-
-1928 and then later versions?I
Hypothetically- which version would have slag marbles with AV and which would have slag with no AV?
Hypothetically there could be handgathered marbles in the Peltier slag colors with AV?
Unless AV use came later?
Green, Purple, Blue,.... If so the hunt is on!