https://images.search.yahoo.com/yhs/search?p=Blue+crown+mark+for+Italy&fr=yhs-mozilla-003&hspart=mozilla&hsimp=yhs-003&imgurl=http%3A%2F%2Fappletreedeals.com%2Fwp-content%2Fuploads%2F2012%2F07%2FCapodimonte-Italian-Porcelain-Factory-Marks-1.jpg#id=6&iurl=http%3A%2F%2Fappletreedeals.com%2Fwp-content%2Fuploads%2F2012%2F07%2FCapodimonte-Italian-Porcelain-Factory-Marks-1.jpg&action=click

Its still too blurred to see !! If you have time look through these marks and see if anything looks like yours !! How the crown looks can help tell where it is from !! But it is not typical for only a cup to be marked and none of the others !! This leads me to believe that the decoration was done in another studio and not by the factory that made it !!