All numismatists try to get coins that have the legend and bust/pattern intact. The perfectionists insist on as near flawless as possible otherwise known as unused. However others, like myself, prefer to have coins that show signs of being use for the purpose they were designed - financial transactions! With hammered there are many factors that go toward the individual grade.With the likes of Henry II's Tealby issues, the silver was used in such thin blanks that mint'damage' was inevitable, though as the result was used, could you call the coin damaged? With the subsequent Plantagenets, the method of production, ie striking with hand tools, caused many variations so that condition is a moot point. An uncirculated Edward I coin could well be off centre or, through heavy strikes, cause pieces to fall off. What I'm trying to say is that grading is a matter for personal assessment. I know that books and dealers offer 'certified grades' but threequarters of a rare coin is still rare! If you are thinking of selling the best way is to leave the grading to the purchaser. If it's for your own collection then be happy with your own assessment! Ramble finished!!!