Your opinions on what may have caused the black horizontal marks on this coin?...I passed on the coin, but now I'm looking at the MM.
What has me worried is the giant scratch right down the middle of the reverse (unless it is a strikethrough, which I doubt). It should not have graded. But the MM is interesting.
Doesn't mean that there aren't others that are unreported. But looking again, it appears to be the lighting.
From the first look I could tell that.... and yes there are new discovery varities but after that. Any years out of the mint the chances are slim to none.