If I am not mistaken, Vacor has been making marbles for many years - like since the 1930s. I do not think we know too much about their earliest glass marble production and I am not sure many people could definitively identify them - I know I couldn't. I wish I had some verified examples of their early production, because if I did, and I found the marbles attractive, I would probably collect them. Eye appeal is important, but if you don't know anything about the origins of a marble, I think it's value to collectors might be limited.