Shudo produced only one robot, this is the diminutive green astronaut with gun, often called simply the Shudo astronaut. The name on the box is a less-than-useful "Mechanical Walking Astronaut". This 13cm little fellow has a pin feet action that makes him waddle along. His distinguishing features are his vinyl arms, the little hand gun that he carries and the NASA lettering on his chest and APOLLO on his helmet. This toy is a very realistic representation of real Apollo astronauts, though the pistol he holds suggests a different scenario.

It's not rare and not especially expensive, but its cute.