1998-D [ATTACH] [ATTACH]
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A grease/debris filled die. No real premium for a coin in that condition.
1968 Mexico [ATTACH] [ATTACH]
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How about doing some research yourself. Look through all the examples and then tell us which one you think it might be. You will maybe start...
.Org is the company site and -X is the brand name of one of their products
From that image it looks like a stain. Less light, more focus and crop away all extraneous background leaving only the coin. A more descriptive...
Photoscape-X which is the same as above. It does a huge amount of things including what you are looking for and can import any of your images from...
Separate names with a comma.