a.k.a. False Idol Skull Stack AP
Signed by Bosko.
This mug shaped like a stack of three skulls was designed and manufactured by Bosko. Each skull has large eye sockets and is missing its lower jaw. Based on Bosko's own carvings at False Idol. As an artist proof, glaze colors and details vary and are unique. There were three artist proofs of this design (orange, green, and blue) sold through Bosko's website but possibly 7 or more in total.