I don't know. I had seen one before and knew what it was when I saw this one, I knew it was valuable, so I grabbed it. I have only seen 3 or so online and this is the only one I've seen in person. Duffytrash says he owned one once, with a yellow streak in it, which makes it a brown traveler instead of a moody blues. C. Garret (know him?) is a big pelt guy and runs a marble show in Illinois. He may have been part of naming the type, not sure.