I have a nickel three cent coin piece that may have an error. http://s1315.photobucket.com/user/goozdude/media/photo2_zpsb273516f.jpg.html?sort=3&o=0 As you can see in the image instead of the date being 1865 it is 1365!
As I mentioned on another forum I believe the problem is corrosion. The surfaces show pitting from corrosion and it has simply "taken out" the left side of the 8.