There's a lot going on with this 1976-D bicentennial quarter. The reverse has a strong die clash remnant, including behind the drummer's head, along with all the die scratches that accompany removal.
The obverse has a crooked die crack along the bottom of the bust. That's not all that unusual, except that there is a tall piece out of the crack. Usually the die cracks are uniform. I can't say that I remember seeing a narrow piece out that stands so tall.
Finally, the interior copper core appears folded up and over the edge of the coin, where it has been struck into the rim. It does not appear to be PMD. I am not sure how the core material could get up and over the cladding like that. Maybe a stamping burr that got crushed over by the upset mill into the planchet edge?
Now that I'm looking on my iPad, perhaps the cladding is just chewed away over that copper spot? Maybe a lamination flake fell off, or the planchet was damaged pre-strike.
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