Mattel released a few demonstration cartridges over the life of the Intellivision. These looping demos were intended for dealer use only, and they are highly collectible today, particularly in the box.
One of the less common versions is the International Demonstration Cartridge. This December 2013 auction originating from the Netherlands generated 14 bids from 8 different bidders. In the end, the winner paid 333.85 Euro (about $452.87) for this rarity.
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