First,

Your coin's obverse shows minor wear on the hair, cotton leaves, cotton blossoms, and cheek. The bag marks and contact marks on the eyes, cheek, and chin and a rim ding at 2 o'clock are consistent with circulation. The reverse shows wear on the eagle's talons (eagle's left, our visual right, especially), outer right wing feathers (our visual left), lower feathers, and head. Contact marks on the "F: from OF and to the right of the bow are consistent with circulation.
I think the old cleaning and possibly also the obverse contact marks would earn a details rating. IMHO, this is a solid AU details coin, with the numerical rating around AU-53 to AU-55. Regardless of a grade or details, the 1891-S isn't worth the cost of slabbing at any grade below MS-64.
The photos aren't quite clear enough to do a
VAM attribution, but you have a far date and high "S" mm coin. I think VAM-10 is fairly likely.
Thank you for sharing your coin!