I would like to see the full obverse of the coin, since one of the main characteristics I use in authenticating a 1909-S Indian is the first three feathertips, and we can't see them in your images. Here's a LINK that should help with authentication.
There are two important points to remember when trying to authenticate any 1909 S Indian: (1) the first three feathers should NOT have full detail on the upper tips, and (2) on the S, the bottom of the top serif should almost touch curve of the “S” mint mark, and top and bottom serifs should be parallel.
Everything Charmy said, plus there are only two reverse dies, and the OP's coin is one of them. The denticle below the left edge of the the S sticks out slightly.
Comments
President, Racine Numismatic Society 2013-2014; Variety Resource Dimes; See 6/8/12 CDN for my article on Winged Liberty Dimes; Ebay
The open S and the fact that it seems to "blend" in with the rest of the coin
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The open S and the fact that it seems to "blend" in with the rest of the coin >>
What he said was what I was going to say...
I'm not really sure about the diagnostics on this coin. You should have it professionally graded.
Here is a 65RB for comparison, FWIW.
Lance.
There are two important points to remember when trying to authenticate any 1909 S Indian: (1) the first three feathers should NOT have full detail on the upper tips, and (2) on the S, the bottom of the top serif should almost touch curve of the “S” mint mark, and top and bottom serifs should be parallel.
The Penny Lady®
I like the strong "S" on your coin, all you need now is a buffing wheel!