Follow the lead picture post.

Larry, are those tiny spots of corrosion on the reverse? If so, have they been treated so they don't damage this nice coin?

Here's mine:

 

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It's already damaged. It's a matte proof.

 

Doh! (head slap) No wonder the strike is so nice...

In my own defense, here is a quote from NGC CoinFacts

"The 1915(P) cent is highly unusual in that it's mintage is fairly close to that of its Denver Mint counterpart. In other words, its mintage is surprisingly low for a P-Mint penny. Why this was so is unknown, but it must have been influenced by the very large mintages of 1909-14.

While not a truly rare coin, it is less often across all grades than other Philly cents of the decade. Fully red gems are very scarce, and even red-brown coins are elusive.

The master hub was evidently retouched by the Philadelphia Mint's engraving department for 1915's coinage, as examples from fresh dies reveal much more detail than on the sharpest 1909-14 cents."

And an example of the detail

 

Sorry for the quick switch!