I'm no pro, but it looks like it to me. Does it end at the base of the bust? Or does it continue on around? The pros will want a full mug shot of the coin. There could be more to it than that if it doesn't stop there. Looks like it has corroded as well.
here are some more pics I also found something at the very bottom near the VDB, its like a triangle shape thing in the last picture.
I would agree with the others guys on the one on the Top, Die Crack, The other one iam not sure but it looks Like an error of some type!