Found 200? Nickel Blank On One Side. Help

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Your coin looks to match number 4 in the list of Dirty Dozen Damages. Even though there is no premium value to these, you might try to find a nice example of each.

1) discoloration - stains from coffee, or environmental damage from being buried, heated, etc.
2) scrapes over much of the coin - damage from sliding on pavement, a parking lot coin
3) coin bent or edges not round - it has been smashed with a hammer
4) coin blank on all or most of one side - someone sanded it down
5) mirrored lettering - a vise job, a coin squeezed against another in a vise
6) rough, pebbly surfaces - coin that received an acid bath
7) smooth rims, smaller diameter - has been trapped rolling inside a dryer, a " Dryer Coin"
8) clear mounds on coin - glue that has dried transparently
9) small indentations in the shape of the letter D - marks left by the impact of the reeded edge of another coin
10) large blisters - coin exposed to high heat, such as in a campfire
11) shapes, often letters or numbers, not indented or raised - Pareidolia (like animal shapes in a cloud)
12) a circular scrape just inside the rim - " Ring of Death" caused by a coin rolling machine

Don't despair! Error coins remain ready to find from circulation, but they are outnumbered by unusual looking coins that merely have been damaged. If you can imagine a way to change an undamaged coin into one like you see, that's probably exactly what happened to it. Changes to a coin after it leaves the mint's striking chamber are considered post mint damage, or PMD, and have no premium value.

Well, this is an original 'do-it-yourself 'error' (not a mint error) the rim is intact and good shape. Somebody took the time to 'erase' the design elements from the fields. Too bad they didn't take the extra time to polish off the scratches too.

to the CCF

I agree with nick10 assessment as #4 on his list. It's simply a damaged coin.

to the CCF At first look, I would agree with sanding. But how would you sand off the inside and leave the rim? And the obverse is effected around the rim like the whole reverse. How ever it was done, they put a lot of time into it.

People had a lot of free time during the pandemic and bought a lot of toys with all the free money that was passed out. I'm guessing someone bought a small home lathe and honed their machining skills on everything they could fit in the chuck, including this nickel.

Just think to yourself. When a coin is struck there is a hammer die, coming down upon an anvil die locked in and under extreme pressure. The odds of either one of these dies having a blank side is nearly impossible. A mint worker would have to slip in a blank (where did they aquire the blank?). And set it in the press unnoticed. Very unlikely. And then get through QC. Not so much of that these days yet very unlikely as well.
Coins are not struck with a blank anvil or hammer die. As far as I know. I could be wrong. If so, someone please post one.

Hmmm .... Am I the only that thinks the obverse might be Struck Through Grease?

Maybe if the Op comes back they can get some clearer images of the obv.