That is cool. I haven't really looked into die cracks very much. But i have seen this, i am much more interested in it. Very very cool coin!!
1865 3CN Die crack almost all the way around. What is also interesting about this piece is clearly the mint re-polished the clash marks from the fields. The coin also shows signs of date re-punching but I have not attributed it yet. (B21b ? off the top of my head)