Have you ever seen this before?

[sixisnine]

I found this today - not sure what to think of it.
Has anybody ever seen this type of fading around the date area?

Thanks,
Steve

 

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[goldencoin]

Grease error, debris covers part of the die and leaves only a vague indentation

HH
-GC

 

[sixisnine]

Thanks GC!
Steve

 

[JD-GA]

Check the rim of the coin where the fading is as well. It appears in the picture to be non smooth like an acid burn. Grease error is likely but i dont believe that would effect the rim where as acid will.