I may be wrong but I wouldn't think this would is just stains considering I can feel the ridges on the coin when I run my finger over sections of it, specifically the on the front of the coin I can feel the shield
Sometimes whatever caused the staining will leave behind a ridge of material which will feel like embossing of different designs. In return, your eyes and mind will take over (like seeing a face on the moon).
kyle965 - a mule is a coin with the wrong design on one side, made from wrongly-matched dies. This 2004 Lincoln Cent has the Memorial reverse which is the correct one for this date. Now, if you found a 2010 cent with the Memorial reverse, well that would be a mule (or a counterfeit!)
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