Here's one I got to fill a hole in my toner Washington Dansco. It's pretty neat, and it's obvious that the slices on the obverse rim at 2 to 3 o'clock line up with the stitching on the reverse at 3 to 4 o'clock. I've never seen stitching on a coin before. Does anyone know what is going on? The images are by Bob Campbell, and I think he did an excellent job.
This is one which would require additional magnification and varying angles to explore. The obvious initial impression is something postmint, as it's difficult to imagine a Mint process which could have this result. But coming from you, my mind remains wide open.
easy: It is out of a mint set. The coin slid to the side and the machine that seals the envelope hit the side of the coin. No value, just fun, but on eBay? Priceless.
This sounds plausible, and was my first reaction as well. My other thought was that this could be a minor strikethrough, but I've never seen one that looks like that.