How many grade points do polish marks take from a coin?

I have a Franklin half that looks like they took a brand new die and polished off the date to change it to another date...and these are the only marks on the coin...it is spotless otherwise...only way you can see it is when you rotate it in the light...It is beautiful otherwise.
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roadrunner
The consensus was PCGS doesn't like them. The reason I asked is that I own a very rare 1921-D Morgan PL.
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