Second in the Brains series - this is a silver Robot with Green Brain. This is the lowered numbered version. Higher numbers are colored differently.
Distinguishing Characteristics
Munktiki Brains mug - Robot
Tiki Mug Design
Robot Brains - Gray
in 7 collections
This mug from Stuckie (Miles Nielsen) at Munktiki is of a light gray robot head, with a green exposed brain "lid".