The Nintendo Crossover was invented by Gunpei Yokoi.
It was released in 1981 in a range of three colours, red, green or blue. I have the blue one as can be seen in the photographs.
I'm unsure as to how many were made, but they seem fairy rare, I've only ever seen one other apart from my own.
Sometimes you see them on ebay but usually for stupid money; Plus an arm and a leg for delivery from the USA.
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