It’s not everyday you see a Game Boy Color prototype board, with functioning screen, so the $415 selling price seems somewhat reasonable. Check out more pictures here.
Up for sale a NINTENDO Game Boy Color Prototype board. This is the only one I recieved from Nintendo and I’ve never seen another one in my years of working in the industry. I call this a prototype board as it was recieved for early work on GBC titles before Nintendo had real GBC units for use in game development. It is in essence a fully functional Game Boy Color unit