Error or PMD?
Often times I run a coin with an oddity that's difficult to explain. Here's one that has me stumped- a 1908 D Barber Quarter graded AU 58 by PCGS:
What's caused this pierced eyebrow effect? Is it a planchet error? A struck-thru error? Or post mint damage? I'm guessing the graders noticed it and would have bagged the coin if it were PMD- but possibly not?