http://www.atariage.com/forums/index.php?a...st&id=89542
Yeah, see, it's a difficult one to figure out. In this picture, take the "Pole Position" logo on the top (thin) end of the left cartridge, and place it on the cartridge on the right, and that's what it will look like exactly, without any differences in copyright information or anything.
The only thing I can guess is that maybe someone fixed it themselves by switching the labels, but there's really no sign of tampering (i.e. rip marks) and it looks too expertly placed. I've been trying to get an answer on it for a while in different forums, but no such luck. Considering I've got a few of what this site rates as 5's or 6's on your site, so I'm not really willing to toss it out as another common one right away, but I also don't really have my hopes up for it being uncommon in any way. I'll try to get a hold of my camera (it's packed away) and post some pics tomorrow.