Help with identifying. 1879S (Rev of 78?) Morgan

I honestly cannot tell if this is a Rev of 78 or just a plain 1879-S. Would someone be as kind as to point me in the right direction?

Thanks!
-JP

 

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Easiest way to tell is the top arrow feathers on the reverse of 78 will be parallel. You have the rev of 79
You can find out more about the different reverses at http://www.vamworld.com/