How much does a rim file take away from the value of a coin?

I'm talking about a post rim file done to hide a rim bump. I have a 1843-0 half dollar that is a well struck EF45 but with this problem. I suppose its worth around $200 without the problem. Its a small to med. size file mark and blends in well with the coin. Also , would it grade? I have seen them in holders before.
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Tom