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Jefferson nickels: What am I seeing here?
Was looking over a few coins and noticed this partial outline of the 51 on a Jefferson nickel. What can you make of it? The coin does have a VEDS strike about it.

Leo
The more qualities observed in a coin, the more desirable that coin becomes!
My Jefferson Nickel Collection
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Solvent front?
Just toning/ discoloration
All comments reflect the opinion of the author, even when irrefutably accurate.
Guessing there was some sort of moisture on the surface and that is a halo from after it evaporated.
Sean Reynolds
"Keep in mind that most of what passes as numismatic information is no more than tested opinion at best, and marketing blather at worst. However, I try to choose my words carefully, since I know that you guys are always watching." - Joe O'Connor