1935 Buffalo Nickel - What is this anomaly behind the "3"?

There is a rectangular-shaped anomaly behind the upper portion of the 3. I don't know exactly what process would have created it. Any ideas?

 

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No idea, there's about 8 known double die reverses and repunched mintmarks for 1935 between the P, D and S mints, whats the reverse of this coin?

Nothing is known for the obverse of 1935 that I'm aware of.

 

Wexler shows 1 obverse doubled die listing each for the (p) and s. The s listing included the date but it doesn't look like yours

 

Here's the reverse. I already deleted the single raw image. I don't see a DDR though.