Part VI. Striking Errors:

Struck-Through Errors:

Struck Through Bulging Die Filling

Definition: Die fill (“grease”) expands and rises out of one or more die recesses like dough rising out of a muffin pan.  The result is a set of incuse, normally-oriented design elements that replace the normal raised elements.  It is speculated that the die fill undergoes expansion as the die heats during the press run.

A full account of this error type can be found at this link: LINK

This 2010 Pakistan 2 rupee coin was struck through die fill that rose out of numerous adjacent letter recesses within the northern arc of lettering on the obverse die face.  The Urdu script is incuse, normally-oriented, and replaces the raised Urdu letters that should occupy this location.  The last few characters on the right are actually raised, constituting a conventional filled die error.  This is currently the only known example of this error type.