Are you talking about the half circle, that runs from the last T in Trust, to the front of lincolns suit, and the back of lincolns suit, to Liberty, thats the obverse side, reverse has a little more going on then the obverse, but same effect
Where the rim splits in two and continues halfway aroumd the coin. Off center strike? Or broken collar?
Conder has already called this one. http://www.ngccoin.com/news/viewarticle.aspx?NewsletterNewsArticleID=122 Read about finning at that URL.