1970’s Yonezawa Prototype. Discovered in the Yonezawa factory, this 13” tall prototype never made it to production. Body is made of plastic with tin legs and motor. Functions include lights in his head and 2 large spinning cogs in his chest.

Prototype Moon Explorer Robot recently sold on Yahoo Japan. Many questions were raised as to whether or not this was a true original Robot Prototype, but after many expert opinions, it was determined that it is indeed for real.  Very crude head styling with transparent face and light up eyes.

This silver prototype Thunder Robot was discovered in Japan at a Toy Museum in Tokyo.  As you can see by the photo this Thunder has a clear window instead of the usual red window in the brown Thunder Robot. The original sticker on the back states that it was produced November 7th, 1967.

Diamond Planet Robot. Probably one of the most desireable and most expensive tin toy robots.  The final production was made as a windup, but this blue prototype exists as a battery operated version. Production date is November 7, 1962

Moon Explorer Robot prototype.  This robot was produced September 15, 1965 according to the manufacturer sticker on the back.  It appears identical to the later production model, except for the clear chest.

This very unusual plastic and tin prototype was probably made in the late 1960’s.  It has the same face as the rare Asto Robot.

Early productions of Horikawa Gear Robots produced September 15, 1965.  These models were used for many different variations with gears and guns.  Graphics are hand painted on these 2 prototypes.