I'm seeing 1929 as the date for the marble vending machine(s) I saw which were actually marked as selling marbles. The ads I saw for the WWII war years were for machines which could be used for either gumballs or marbles and didn't specify marbles on the machine.
Soirry, no pix. I tried but the pix disappeared from the old thread I consulted, so I would have to do some digging. And what I'm supposed to be digging for is my address book. Grrrrrr.
Just checking in. Later!