First off, your penny doesn't look like a weak strike, it just looks like it's been worn a lot. Here's a hint for weak strikes: The center of the coin has more detail than the outer edges. Just a small hint. Keep looking through coins though, you might find something good one day!
It's NOT wear or grease, it's a die fill issue common in this area which is opposite the head. It's caused by insufficient die pressures, evident in the poor formation of the memorial building too.
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