Struck Through Struck Fragment
by Bill Snyder
At times, a coin is found with a part of the design of one side somewhere on the other side. That section of design is "set in" and reversed, like a Partial Brockage, but it may not be at the edge of the coin. (Partial Brockages, to the best of my knowledge, always incorporate part of the coin's edge).
Notice the reversed "DN" on King George's cheek in the this image. This type of error is called a Struck Through Struck Fragment.
It may have been created this way:
A small piece of a coin sticks to a Die (or falls on a Die) as the Dies separate.
A new blank planchet enters the Coining Chamber and it is struck not only by the two Dies but also by the intervening piece of previously struck metal. If that metal fragment is indeed firmly stuck to one Die, the reversed image that it imparts to the new coin will be part of the design of the other Die (and in the same relative position).
In our 2 Annas example (above), the letters "DN" appear (reversed and incuse) on the lower part of King George's face, in the same relative position as the letters "ND" (from the word "INDIA" of the Reverse).
* Notice the similarity between this type of error and a full
Brockage error. A "Struck Through Struck Fragment" occurs when a piece of a
struck coin falls or sticks on a Die. A full Brockage occurs when a
whole struck coin sticks to a Die.