Back before Nintendo decided to make the cartridge-based Nintendo 64 and before Sony decided to make its line of disc-based PlayStation consoles, there was a brief collaboration between the two giants. The result? The rare, prototype “Nintendo PlayStation.” It obviously never came to market, but a prototype is up for auction and may well go for upwards of $1 million.

Its original owners came into possession of the strange piece of video game history through a bankruptcy auction that included items from a former Sony CEO. The strange device, one of only about 200 hundred prototypes ever made, is the only surviving console known to have survived. The auction, which will continue for 21 more days, has already attracted big bids, with the price already up to over $300,000 and is attracting attention from people with mountains of cash, who you’d be hard-pressed to outbid.

The owners of the console reportedly turned down a $1.2 million offer to purchase the device outright, which says plenty about how high they expect the number to go. This could wind up being the most expensive video game console of all time.

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