While I gave it a 55 in my initial response, I want to give a little more nuance: If it were to straight-grade, I think it would come in at 53 because of the strikes on ON(E) and (CE)N(T) knocking it down from a 55. But there is a good chance this coin would get a details grade because of that damage.
Looks to me like a straight grade and would go 53. Some areas of friction & as an example check the LIBERTY letters... That grime drives me crazy and wonder that a bit of soap and water might do something although toning under the grime would be different than the metal surfaces around the grunge.
The coin has the sharpness of an AU, but does not appear to have any luster, which is usually required for the grade. I would say the slab grade would be AU-50 to 53. Of course with "grade-flation" it could be AU-58. Here is an MS-64, R&B,t to show you what luster is. A "Brown Unc." will have luster under the brown surfaces.
