It maybe just a linear gas bubble if the coin is a Zincoln. If it flows over the devices and not just on the fields it could be a bubble. Year of coin would help?
If it is a copper cent, and the area in question is only on the fields, it might be a die dent. If the area flows over the devices it might be a crack. But I thinking it isn't. Closer images and date of coin would be a big help.
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