1964-D Lincoln, Heavy Abrasion On The Mint Mark Field, Not An Error But Neat

Found this one in a bank roll yesterday. I've seen mint marks in the past that were tiny or weakly punched but this one created a question in my mind. You can see the heavy abrasion marks which are only present on the fields in the area of the date and MM. It almost looks like a mint worker tried to polish off and eliminate the mint mark? I don't think it's any sort of die clash because the reverse looks pretty normal in the AME area where a clash would have affected the reverse based on overlays. Just a pretty cool Cent and I thought I'd share for any ideas or feedback. I supplied the close up pic of LIBERTY just to show that there are not any abrasion lines like the ones in question. The fields on both the obverse and reverse are smooth other than the obvious dents and dings. Thanks!