It's a late-stage brockage.
My diagnosis must be considered tentative as your photo is not ideal.
The most likely explanation is that the reverse die was covered with a heavy layer of compacted "grease" (lubricant mixed with dirt, metal dust,...
These are merely figments of your imagination.
There's no evidence of a double strike. And a double strike will not necessarily cause finning. Increased striking pressure has nothing to do...
It's not a misaligned die. The obverse rim shows "finning" due to excessive striking pressure.
As many others have said, the perimeter of the obverse face was mechanically eroded. Ground off or polished off, in other words. The sloping...
As several others have correctly concluded, this coin was damaged outside the Mint. Both faces have been pummeled into a mushy mess, probably...
It's a lamination error, with some damage to the flap of metal that lifted off the surface of the coin.
It's a glue job.
The coin appears to be as thick as a normal quarter. Copper toning has invaded the obverse face. Both observations indicate that this is not a...
As far as I know, the source of this discoloration hasn't been established. Tying it to the annealing oven is simply a guess on the part of the...
I don't believe it is genuine. Too much of the "first strike" is preserved and there is too much blended overlap. I do see some of the sharp,...
It's collar clash. It's caused when the obverse die hits the top of the collar and/or scrapes along its working face. The obverse die would have...
Since the weight of this coin approximates that of a missing clad error, perhaps that's what it is. Perhaps the exposed copper core on the...
That's as light as a missing clad error. It's possible this started out as a genuine error and then the reverse was attacked with acid or some...
Very puzzling. As you say, the weakness at 5:00 and 7:00 on the obverse face would point to a genuine planchet error. On the other hand, the...
Rascal first took this coin to the CONECA Forum where he didn't find answers that satisfied him. So he took it to this site. It's clearly a case...
The coin that started this thread looks like it may have been struck through a very late-stage die cap.
The 2009-P dime appears to have been struck on an improperly annealed planchet. Excessive heat, prolonged exposure to heat, or excessive oxygen...
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