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Four rings of ten balls each.
There exists another version (search for "Screwball" in the museum) with a middle layer that is one marble thick.
If you're looking to buy, eBay is the one place you can find almost anything... if you're willing to wait for it, then pay the price!
Thank you to the following people for their assistance in helping collect the information on this page: Geert Hellings.
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