to CCF, other than another request for better pictures I will add that some of the '78-S mint marks can look square when worn down from circulation. There are several reverse dies that had the mint mark filled that added to the effect. Here is an example from VAMworld.
There is a photography section that is full of great information regardless of what your equipment is. Do a few searches and see what you come up with and do feel free to ask questions.... http://goccf.com/f/81
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