Its likely the lack of even patina on your coin. It's 200+ years old, it should have a good brownish even patina over the entire surface. The lack of even patina usually means it was cleaned at some point, but it could have been years ago as it does look like its trying to pick a patina back up. With time, it could 're-patina' but not if it stays in that sealed slab and away from oxygen.
PineTreeSniffer t1_j21f4k6 wrote
Reply to comment by Guitrum in It took over a year, but I finally got my first coin grading back! by Guitrum
Its likely the lack of even patina on your coin. It's 200+ years old, it should have a good brownish even patina over the entire surface. The lack of even patina usually means it was cleaned at some point, but it could have been years ago as it does look like its trying to pick a patina back up. With time, it could 're-patina' but not if it stays in that sealed slab and away from oxygen.