A few sellers are selling fake Game&Watch items on eBay. Be careful when buying G&W! 
Inside there is a golden diskette. I suppose that this item was produced at the same time like the game Super Mario Bros. YM-901 and probably it was given away in 1987 for prizes at the Famicom F1 tournament in Japan.Unfortunately I don't know how many of these Disk Stations have been produced, probably about 10'000.
