Here’s a Pengo Prototype. I believe this is one of the runs from Best Electronics, due to the blue warranty sticker (usually found on carts sold by Best). Without looking inside (this is not mine), there is no way to tell if it is a repro/copy (fake) or an origianal rom. I have read about Best making copies of protos, so I would bet that is what this is.
Dukes of Hazzard– a completed and bug-riddled game that was never officially released by Atari. Can you save Daisy? (That’s her on the top right of the screen shot). Check out Boss Hogg! The General Lee is the red car with white X on it (X being the Stars and Bars?). You get chased around a bunch of mazes by white sheriff cars until you make it to the jail and save Daisy.
Do you have one? Not sure if this is a “Best Electronics” build, or an actual prototype. Comment if you know more.