I am relatively new to coin collecting, kind of got thrown into it, but I have to say, I am kind of enjoying it. That said, I have researched many coins and errors for coins. My biggest problem is determining if something is or is not a double die. Some, like the 1983 penny reverse doubling is easy to spot, others not so much. How do you really know? any tips for a newbie? also, attached are 2 pics with items I question as doubling. They probably are not, but any opinions or pointers would be helpful. in the pics I see a small doubling under the ear and the 5 of the date. Am I correct, or is this just wear/damage and or just how a zinc penny is? Thanks in advance!