Is there a price guide of some sort for these medals? I am curious how much value did I lose by polishing? Is an AU Great Wall medal worth the cost of grading even? I mean, if it costs $200 to grade and an AU coin like this is only worth $200, then it's not even worth grading, right? I wish I would have known a few years ago what I know today because of course I would not have polished the medal then. That really sucks that I did not know that several years ago.