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At one time, Bill Cokenhauer had two for sale at Ohio and other shows. I think they sold after quite a while and later Bill had a third one. IMO they are far more paperweights than they are marbles. Kids marbles aren't made in such large sizes. The technique is also paperweight.
I don’t believe I am familiar with Chinese transitionals. Would love to see some more. I was going to throw Bulgarian out there as a possibility especially because of the size, but I am unfamiliar with Chinese ones. Talking about the original marble.
If that's a pontil, Id guess it's transitional. I have a similar one that appears in an eBay lot. Wider ribbon, but similar.
The verdict so far is Japanese.
I'll take it with me to the Maine show.
I have a pile of dug Jacksons. Similar pattern to the swirl, similar base glass, only one glows in the UV. That is only a bone, sorry. I'll scour my wvs pile and see if I can compare.