Doubled Die:

Single Squeeze Hubbing:

Centrally-located doubling

Definition:  The majority of centrally-located doubled dies are generated by the single-squeeze method of hubbing. During the single- squeeze process, two mishaps may occur.  Sometimes a slightly tilted hub (or die) will settle spasmodically, causing a “skip” that will generate a secondary image.  At other times a technician will interrupt a hubbing in its early stages in order to re-position the hub or the die.  When the hubbing is restarted, this

may result in offset impressions.  This is not inevitable, however, as the second hubbing may obliterate the impression left by the first hubbing.

The following images (top left and right) depict some centrally-located doubled dies seen on the 2009(FY) Lincoln cent reverse die.

The image located above left shows a doubled ear lobe on a 2008 Alaska statehood quarter. The image to the right is a bit more unusual; this doubled die is found on a 2000P Lincoln cent. It shows a faint secondary statue of Lincoln located beneath and rotated 180° relative to the regular statue. The images are courtesy of John Wexler.