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Message:: [QUOTE="Insider, post: 7803119, member: 24314"]Thank you for your response. 1. Genuine Mint Luster.  This is the Best One.  That's because the original mint luster of the zinc portion has yet (?) to be duplicated.  IMO, virtually anyone <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie30" alt=":bucktooth:" unselectable="on" unselectable="on" /> can authenticate an unplated/part plated zinc cent for this reason. After that, it get's EXTREMEALY difficult leaving lots of room for disagreement - sort of like toning.   Much of the time, if you were not there the see it happen...That's why folks rely on the opinion of the error experts mentioned above and others who were left out. Zinc is a very active metal subject to corrosion.  Once it becomes worn, that adds another layer of difficulty. 2. No corrosion.  Genuine unplated zinc cents can corrode. 3. Details should not be fuzzy.  Friction wear from circulation removes detail. Therefore, a coin that is not 100% original often drops into the "It's my opinion" category.  Modern cents are subject to chemical alteration.  It is MHO that many genuine UNPLATED/PART PLATED coins have been condemned as "altered" because of that.  It may also be true that altered coins may get called genuine.  If this is done by a TPGS that error is covered by a guarantee. [USER=92083]@JCro57[/USER] I cannot find your book.  Perhaps you can inform all of us where we can get a copy.[/QUOTE]