I know it isn't plated. My father-in-law pulled these from circulation when he was young. I have several, a couple in better condition and many in worse condition. The scratches on the shoulder are visible on the coin surface, but those grey splotches on his face aren't visible on the coin, I think it may be the plastic reflecting or interacting with the camera flash.
Here's another of the better examples without a smudged date.

Here's another of the better examples without a smudged date.





















