This is a neat little item I recently added to my collection of Antique Honda's. It's called a Cuby, and it was developed to use in "Tama Tech" (Honda fan fun lab), for visitors to take apart and put back together, to get an idea of how a simple engine works. After the engines served there purpose, they were sold off to dealers (at $15 a peice in 1962-63, lol), who then either kept them as display items, or sold them to the public.
Here's mine:
Here's a picture off an all red one, to give you an idea of it's size, as you can see, it's incredibly small:
And here's one that is brand new, still in it's original box:
Mine was used, for what purpose I don't know, but I plan to fully restore it (which shouldn't be a very hard task). According to some of the literature I have on these, Honda only made 800 of these units, and I know of about 15 people that have one, so I guess they're pretty rare.
Jason.