Is This Feeder Finger Damage?

Looks like wire brush marks.

Not an error coin.

Good pics.

Chances are there was a die clash which would have left an outline of Roosevelts head. They would have had to wire brush/polish the entire circumference if the clash was strong enough.

Below is a link to a clashed Roosevelt reverse. I found years ago.

https://goccf.com/t/230006

So when they found these clashes being made they would scrub them off with a wire brush and polish it? Interesting, I would never have known that, thanks for the info Jake and nice find. You'd think someone at the mint would attempt to polish this die out again to get rid of all those scrapes before making more dimes. Its really cool how the scrapes on the outside fields went into four directions leaving the center fields all smooth (diamond shape. It was a "eureka" moment for me and I don't get them often.

The story I heard was that they were give just a few dies that year and they had to keep polishing them as they were not getting more. So the obverse dies suffered.

What you are seeing is something the mint called "stoning" of the dies. Sometimes to remove clashmarks they would use an emory stick with coarse abrasives to scour out the marks. Now ideally this would be followed with finer abrasives and eventually polishing with a circular lap to remove all the scratches left by the coarse abrasives. (Polishing out heavy clashmarks with the fine polishing lap would that forever.) Well that didn't always happen, maybe they forgot or were pressed for production and the coarsely abraded dies were put back into service. We call all of these marks coarse, fine, or almost invisible, die polish lines. Although in the early stages they really aren't "polishing".