And if you look ont he outside edge of the last 5 of the date you will probably see the same effect to a degree - the 5 will have a shadow of a hump next to it. This is what people called the "1955 poor man's double die" and sold for $5-$10 a coin back in the day. Heck, they still do it! And these things aren't worth anything more than any other 1955 cent.