I don't know. But I believe this is the type of mug that can be made from a mold at a pottery class type setting, then decorated by the student. (I know, that's not exciting to hear, but the seam on the bottom makes this to be the way it was made).
Looks to well done for an art class ----- Why not try the guys name on E bay search , When ever I get in a JAM I go there good resource to ID STUFF - Good Luck