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Copper specks on clad coinage

JimWJimW Posts: 527 ✭✭✭✭

I was looking at some BU 1999-D 50C and noticed that some of them seem to have sporadic small copper colored specks on some of them.
Is this due to a weak clad layer or some of other part of the minting process, or something post-mint?
They've been in unopened paper-wrapped rolls for the last 22 years....

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