Just to clarify. I posted Odyssey in the title because that was on the cartridge. I do believe this is a Colecovision cartridge? Also, the "other" Odyssey cartridge prototype I was talking about is the Killer Bees for Odyssey 2. Once again I know nothing about either of these games beyond the research I did in the last couple of days. Here is a picture of the Killer Bees game.