Reading in the Alley book, I see that Rosenthal acquired the Lawrence Glass Novelty Company in or around 1931, and had been doing business with them before that.
So that would suggest that Rosenthal jobbered early Alleys? And possibly his own LGNC marbles after that?
Also referenced in that section (pp. 11 and 12) is Akro cullet found at the LGNC site.
(This was in Sistersville.)