I'd say grease or a possibility could be cloth/paper, think that's a long shot, I'm not the guy to ask really but someone will have the diagnosis . If someone grinded it off then it wouldn't be as smooth and even as it is.
I would say that it was struck through grease or other debris. This is an great example due to the surface it covers. It's also s common error. Save and protect it but it's not worth grading as it would only bring about $5.00.
The dang Cat said no such thing! All Meow said was that Meow would love to add it to the Cat hoard. Meaning such a coin would definitely be a keeper for Meow. Why are always such a Neckbeard?
You guys just have no sense of humor. You get upset, so I just roll with it. Do I really have to use visual aids every time I throw a cream pie in your face? Chris