AU-50. This coin has no major flat spots from wear, nor any distractive contact marks. But the obverse is too rubbed out for a 53. A very eye appealing and original specimen, and one I would gladly buy for my own collection at the right price.
I use dollar sized 2x2's to contain my bust halves.
I concur with Ty2020b that this is an O-102 with a rarity of R-1,