Thank you, Winnie! Thought it could help someone one. And fun to see your stash.
Bob, no distinction. When the salesman box was first employed, there was a distinction between the marbles in those two compartments, but this is a box from the 1930's with what I think is a marble selection from the 1940's. And the 1940's people covered up the original labels and had to fill 'em with Akro's more limited selection. ... is how I think it went.