The Mint Sets should be just fine since those coins are the old bronze composition, not plated zinc. Odds are that coin spent a little bit of time on a freshly salted sidewalk this winter to end up corroded that quickly. Which Lincoln reverse is it?
I like to Metal detect on weekends and here is a link to show you what is happening to the Zincolns in the environment, 5% of the Lincolns I find now look like these. I've seen alot of people trying to sell these kind of coins on ebay as Error coins and it irritates me to no end. http://forum.treasurenet.com/index....51358.0.html
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