I am pretty new to all of this, so this may sound like a stupid question. I have a 1976 "kissing penny" as I am told its called, but it also has a raised image on the back side. The image appears to be of a torch. I know its not a strike thru error, because it is raised like the rest of the images, only its raised even higher than the rest of the image on the back side. Is this a common occurance with this particular coin, and if not, where can I find out more about it, including how rare and how valuable?