Large antique marble - maybe early 1900s american machine made?

[SilverForBrains]

Hi folks, I just posted this in the garage sale forum (sorry for those who already saw it!) before I realized there was a separate marbles forum. I will definitely be frequenting here from now on, my first find has got me hooked. I noticed this baby on the far back of a rack in goodwill. 99 cents. There are a lot of small bubbles, I don't know if that is any identifying feature. The color and patterns you can see in the pictures below. I can't feel pontil marks, but then again I don't really know what I'm looking for. There are some scuff marks and a couple of divots, which you can see in the third pic on the upper right of the marble

any information on this marble would be greatly appreciated!

 

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[duffytrash]

inspect those bubbles under magnification....i like it!!!!