Most likely it was just assembled at a Service Center using a replacement label and shell. There's no record in any of the binders I have for this cartridge. These parts were available to any service center and they could have easily made a yellow test cart of almost any game. Very cool find thou, def one of a kind!
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Looking for Black cartridge Color Dreams games, last 3 I need: Metal Fighter, Moon Ranger, Baby Boomer. Please contact me if you have any of these!