There is a very obvious "tell" on this coin. there is a die crack that runs under the bottom of the reverse.
Here's mine, it's a 1876-S Type II Reverse . The variety number is 103 ( Obverse 2: Medium Level Date, Large Knob 6, Weak Head Reverse A: Small Filled S,[mm C,C,TL] http://www.seateddimevarieties.com/date_mintmark/1876st2_103page.htm