Tin Litho, Acrylic and Plastic. Made in Japan. Battery Operated. Advances with walking motion as Pistons move inside the Chest. Measuring 27.0 cm. or 9.8 Inches.
Piston Robot by S.H. Horikawa ® Click to Enlarge
Engine Robot by S.H. Horikawa ® Click to Enlarge
Engine Robot by S.H. Horikawa ® Click to Enlarge
Source: Internet, My Collection - Updated 05-14-2016