Grease Filled Die? Or PMD

I saw this dime and I thought that it looked interesting so I decided to do some research on it and I think that it’s possibly a grease filled die error. I can see that the mint mark is from Philadelphia, the year appears to be 2000 and the “LI” for Liberty appears to be covered by the error and the “TED” for United also looks smooth. sorry if this is a post mint damage coin. I just want a second opinion on this dime.