Before you make your mind up about whether to repair or not, you might like to consider the work of the American who runs this service: http://www.crs-stockton.com/index2.html The before and after photos are impressive, BUT I have not seen his work on anything hammered, so can't say how he would perform on your coin. Let's just say that he has done a fantastic job on the coins shown on his website. If you didn't want to use this guy, then I would certainly echo the points on here about not having it crudely plugged, as that will only make things worse.