Hard to say from the photo of just one side. Looks around XF45-AU50. Check out PCGS's photograde? Lance.
Other than having gone cross-eyed from the provided image, something does not seem right and I cannot tell if its corrosion or....? Any chance you can post a better photo?
I think it is probably XF40-45 details, and harshly cleaned. Looks pitted, and there are swirl marks on it--signs of being whizzed, or wire brushed IMHO.
I agree with corrosion/pitting (now that I look at it on a better screen). Hard to say if someone tried to lessen the look through polishing or whizzing. Not much at stake for 60c. Lance.