Grades are subjective opinions and nothing more. It has not been "professionally" graded, but as a collector for more than thirty years I use RedBook and PCGS standards, and believe my grades to be conservative and equivalent to anyone from PCGS, NGC, etc., etc..
Welcome very nice coin, will be bidding at end,because listia holds credits thats when the big bids come in just in case you didn't know, also will help if you get verifed, being you want money for shipping how do we pay ,