PART VI. Striking Errors:

Machine Doubling:

Machine Doubling in More Than One Direction

Definition: Up to three different directions (north, south, east and west) of machine doubling can be seen on the same face of the coin. This multiple direction type of machine doubling should not be confused with Longacre’s doubling.

The 1991-P Lincoln cent shows three directions of machine doubling. The first image to the right has machine doubling on the east side of Lincoln’s bust.

The same coin’s date has machine doubling on the south side of the digits as shown in the image to the left.The  image to the right of the same coin shows machine doubling on the north side of the RTY of LIBERTY.