Yes, they definitely had machine-made marbles in 1926. Slags, Cornelians and Imperials. And they had Flinties and Moonies in 1929.
I just don't see room for the patches -- or for Spiral style corks -- between this advertisement from 1929 and the "beautiful new line of marbles" Akro introduced for children to name in 1930, AKA the Prize Names.
I don't recognize two of the patch/ribbon patterns in the machine as ever coming from Akro. One of the patch patterns does look like it could have come from Akro but, again, in a later year.