hello just wondered if any1 can help with the coin i found whilst digging in the garden? its very thin, i can just about make out new penny written around a delicate looking crown with 1/2 at the bottom. i cant make out the other side as it has gone quite green, but could possibly be latin written around the edge.the coins width is 12 mm and it is 1 mm thin. any news would be gratefully received, thanx for you time