It's die damage, specifically a series of die dents.
It's die deterioration. A ridge ring is one manifestation, and we see that in this case.
A ragged fissure. These open up in the coin metal strip from tensile forces that build during rolling out of the strip.
It's an off-center strike featuring contact with a strongly tilted, partially deployed collar. It also shows a minor die attrition error next to...
It's hard for me to determine which design was struck last. But it was silly of me to assume that the later design was that of the counterfeit...
I've also been writing Coin World's Collectors' Clearinghouse column steadily for the past 13 years.
It's clear that the second strike (1967) was delivered by a pair of counterfeit dies. These are not that hard to make. The irregular surface and...
This is a split die straddled by what is almost a retained interior die break. Since the sharp border does not completely surround the elevation...
1985-D dimes are notorious for poorly struck design rims, especially on the obverse. The poorly struck rims are teamed with an especially...
Many recent nickel dies have been similarly affected. The leading hypothesis is that this is hubbed-in debris. But it's decidedly odd that it...
Struck against a stiff collar which generated a forced misalignment. As far as I'm aware, the grading services do not recognize most stiff collar...
The OP's coin is not a "dryer coin". But it is damaged. Both faces were heavily abraded after the coin left the MInt.
Heavily worn dies. This specimen is on the verge of developing a case of "peripheral die expansion and erosion", a phenomenon so far only...
In hobbyspeak, an "indent" refers to an indentation made by an unstruck planchet. A partial brockage is an indentation generated by a...
This is neither a dryer coin nor a spooned coin. But it is damaged. It was rolled and squeezed in the horizontal plane by a hand-cranked or...
This is clearly an off-center strike. Both off-center strikes and broadstrikes are struck out-of-collar.
The reverse was buffed in a radial fashion. The peripheral lettering was distorted as metal between and lateral to the letters was eroded. This...
I see no clash of any kind on the left-hand coin.
The reverse was mechanically altered outside the Mint. It's not an error.
I would call it a "ragged notch", but it arises in the same manner as a ragged clip, ragged perforation, and ragged fissure.
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