Inspired by others here is my first guess the grade. I'll give it a day or so to let everyone have their chance. Good luck to all.
Nice coin. I'm leaning towards AU58, RB as well. Some wear detail might be washed out (crisper photos might clear things up), and Obverse looks a bit better than the Reverse. 4 diamonds. Could be higher...just can't make out the wear/dings.
Thanks! The prize is the knowledge that I hold you and all the other coin folks here in the highest esteem.