Class VIII (Tilted Hub Doubling):

Weaker Impression Hubbed Last

The 1963-D Lincoln cent pictured below was struck with a tilted obverse doubled die (Class VIII). Only the last digit shows doubling. The faint 3 digit may be the result of a light, accidental contact between hub and die after the final hubbing was completed.  Other explanations have been floated for this unusual doubled die.

Image courtesy of Coppercoins.

Another example of a tilted (Class VIII) obverse doubled die is seen on this 1915-D Lincoln cent. Notice the extra bar under the L of LIBERTY. Again, this could be the result of an accidental meeting of the hub and die after completion of the hubbing process.