OK, one other comment here....
This could very well be the reason there is such a mix of marbles here in the south. Being poor in the 30's, 40's and 50's, the south probably saw more bags of marbles from the Marble King company than "brand specific" packages. I do realize that "playing for keeps" would mix marble brands. I personally don't remember seeing much in the way of packages on the shelves EXCEPT for net bags and cellophane bags like the Marble King bag shown above. NOW, THIS IS JUST A THEORY so don't hit me too hard..... LOL. I do know that no matter how many batches of marbles I have been privy to "getting first look" at have been mixes of all makers.
Just a theory now...... just my theory.......LOL.