Proton Robot. Rear early production version which was long sold out by factory around 15 years ago. Unique primitive 1950's style square head and spring across his head. Proton Robot stands 5 inches tall and walks forward via "pin walking" foot design enabling him to sway side to side as he moves forward. He carries a wrench in his hand as his arms also mechanically sway back and forth as though he he is marching. Complete mint and boxed with gift box. Tin Robots are adult collectibles not for children.