Bad camera or more likely it's been buried and cooroded-- looks a lot like tough CC silver issues that show up sometimes that were picked by metal detectorists.
<< <i>An overly compressed image will do that to any coin >>
Jeremy nailed this one. What you are seeing are jpeg artifacts. It is also plainly seen in the upper edge of the coin (looks like a stairstep or a block pyramid instead of a smooth curve)...Mike
Collector of Large Cents, US Type, and modern pocket change.
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<< <i>Perhaps it's toning over really porous surfaces.... >>
<< <i>An overly compressed image will do that to any coin >>
Jeremy nailed this one. What you are seeing are jpeg artifacts. It is also plainly seen in the upper edge of the coin (looks like a stairstep or a block pyramid instead of a smooth curve)...Mike