It looks like it would grade about F-15. The greenish areas are perhaps a problem since they could indicate the copper is beginning to corrode. If the coin is corroded, Forum member Bad Thad may be able to help. He markets a proprietary product called Verdi-Gone that may remove the copper corrosion and save the coin from further damage.
I think you paid an OK price from the coin, although I would have held out for one without any suspicious surface issues. Just my opinion!