I was at the Oakland Flee Market about 3 months ago and picked up a bag of loose 2600, nintendo and some 8 bit carts. Not really looking at the 8 bit, they were part of the package. I normally do not collect them. I just started to sort them an notices one did not have a name, but it did say Moon Patrol EPROM Cartridge 11-30-83 on the back of it. I'm guessing it's a prototype. Let me know what you think.