Error Showcase: Lincoln Cent Struck on a Nail

One step beyond a wrong planchet error is the non-planchet error which occurs when a foreign object is struck in a coin press.  In the example shown below, PCGS identified the object as a nail.  The head and edge thread evidence suggest a bolt which is a more common fastener in the machine intensive Mint environment but that point is trivial in light of the sensational appearance of this error.  See more photos and the full description at:  eBay item 291482789807

photo credit: ebay sullivannumismatics