"Ship Model" blessed is a docked ship named Model and it is not HTML. At some point there was a patch that eliminated th "A" in several things. So "A Ship Model" blessed is just pre-patch docked ship named Model. So it is slightly rare. "Ship Model" not blessed is the server birth rare. If you double click a blessed ship model either with the "A" or without you will get the ghost ship that can be placed. The server birth version to my knowledge does nothing when double clicked.