Ok, so I literally just started coin collecting and I'm absolutely loving it. I sat down this afternoon and started with pennies. I have 1 of every year from 1960-2012 with a D Mint mark, and about half of the same with no Mint mark. I noticed on the pennies that 1 of the 1970's I found had a mint mark that was sat higher and looked smaller. it just stood out to me how it looked awkwardly high. I do not know all the little details about these and was just hoping someone might be able to explain why this mint mark is different. I thank you all in advance for your help.