What's going on with this trade dollar?

I spotted this rather abused 1875 CC trade dollar on eBay. The reverse has some doubling under the eagle's head extending down the outside of the right facing wing that I have not seen before. The coin looks genuine to me. Is this just an extreme form of machine doubling?
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Looks like a scratch to me. Damaged.
Could be, maybe I'm just reading the images wrong; interpreting a scratch as the edge of a shelf.
My first thoughts were a clash of some sort as the line really does not replicate the eagle's profile and wing exactly. Looking closer, I too believe that it is a scratch. The mind can sometimes play games depending on what it expects to see...
mbogoman
https://pcgs.com/setregistry/collectors-showcase/classic-issues-colonials-through-1964/zambezi-collection-trade-dollars/7345Asesabi Lutho
It's a long scratch.
See the other lighter scratches
on the left side of the field -
I enlarged the photo, and can see
the 'valley' of the scratch.
Looks like someone started to trace the outline of the eagle
Successful transactions with : MICHAELDIXON, Manorcourtman, Bochiman, bolivarshagnasty, AUandAG, onlyroosies, chumley, Weiss, jdimmick, BAJJERFAN, gene1978, TJM965, Smittys, GRANDAM, JTHawaii, mainejoe, softparade, derryb, Ricko
Bad transactions with : nobody to date
It's definitely a scratch.
Shame, nice looking TD.
sorry to see that scratch
Thanks all. Like 1630Boston said, It seems someone doodled a partial outline of the eagle. Too bad.
graffiti and nice cleaned surfaces
That's a huge scratch. And certainly not worth the $1k he's fishing for.
https://ebay.com/itm/1875-cc-Trade-Dollar-Original-UNC-Detail-Proof-Like-Field-110145/362230135768?hash=item5456993bd8:g:ZD4AAOSwY3BZDjXN
problem coin
also cleaned
Despite the cleaning and the scratch, I kinda like it.. almost makes the eagle look like it's moving kinda..
Definitely looks as if someone was tracing the eagle in that area....Certainly a post mint scratch... Cheers, RickO