Fun variety. It is called an S-9 clash die coin. The obverse die of the cent was clashed with the die from the 50 cent piece. I would grade it XF. Nice coin.
1857 was a crazy year for clashes. The cent dies were also clashed with the quarter and the $20 gold piece dies. All are popular with FE cent collectors. You will find all of them listed in the CHERRYPICKERS GUIDE.
A die clash occurs when the two dies hit together without a blank in between. The highest parts of the die leave an impression on the other die. Look above the eagle's front wing and you can see the impression.