I recently found these miniature models here in The Netherlands at a swap meet. They look to be solid diecast, made in Japan by the "Model Planning Co. Ltd." and most of the boxes indicate a scale of 1/150 although there are some boxes (for the same model!) that mention 1/130 and that is all I know about them...
These models are really tiny as the Fiat 500 measures only some 22mm or 0.86 inch!
I was so intrigued by these little gems that I bought the lot of them (sounds like a volume purchase but there were actually only 10 in total). Below you will find a list of the models and colors available. As usual, clicking on the picture will bring up a larger version of it.
Please note that when they're gone, they're gone as I have no idea where to source these.
We now offer FREE shipping to ANY destination in the world to on ALL these models !!