1877/6? I do know that the 1847/6 is a hard rpd/overdate but I don't think I've heard of the 1877 overdate. Pictures please
After a little bit of looking I see that it is a recognized variety now by Pcgs with the help of Bill Frivaz. Here is the Pcgs coinfacts of this variety http://www.pcgscoinfacts.com/CoinDetail.aspx?s=96355&redir=t