You've just given us all hope that the really cool stuff is out there, just waiting to find us. One of a kind is an understatement. Congrats, and pay no attention to the offers you get for it - from anyone. I mean it. Might want to insure it though - $20K seems about right to me.
Now, what the hell do we call this finish? Kind of reminds me of an active volcano - how about Kilauea?