On Jefferson's jacket you can see the number 6, is that one of the marks you are speaking about? Yes, that's definitely "man made", it's called a counter-stamped coin. What did to "6" mean? Your guess is as good as mine. If you search on it (upper left hand corner) you'll find a whole section here on CFF devoted to counter-stamps.
Most people here use their phone's camera which usually does pretty well. There is a whole section on that too here on CFF!
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