Wow. A lot of capped busts have been found lately. Maybe its my turn. Try pouring some salt in a piece of tin foil, place coin over salt, then pour a little white vinegar in and add some more salt to the top of the coin. Fold the foil over the top of the coin, wait and then gently remove coin, rinse then rub with your finger. Do not rub until all salt is rinsed off or you will scratch it