I have a strong feeling that this one is from Mike Mount, since I have one of his very similar to it, but since I can't find a signature on it, I'm just not positive. Regardless, it's a nice sized marble with a VERRRRY deep vortex, so deep I had a hard time getting the light down in there. It's a neat design with the stretched dots. The backside is very organic with some dichro peaking out from beneath the dots. Fun marble at a great price!