I don't know much about Robbie, but I do know that the image he used in this marble is a suuuper early boro murrine image of the Simpsons' Chief Wiggum created by the great Jerry Kelly. The murrine was create in the 90's, and so I'm thinking the marble probably was as well. The other side of the marble has a sand-colored dot implosion. This is a crazy sweet piece of history for you murrine collectors out there.