Editor's Note: Saul Teichman is one of the top numismatic researchers. He has concluded that there are only four known Presidential Dollars that were struck either on wrong U.S. planchets or struck on other U.S. coins.

Off-metal errors occur when a correctly made blank from one denomination is accidentally fed into a press for another denomination. Examples are a nickel struck on a cent planchet and a cent struck on a dime planchet. The coin struck on an incorrect blank will weigh exactly what the denomination of that blank would have been.

One of the most expensive, popular, and desired types of errors are the double denominations. This error happens when a coin is struck on a previously struck coin of a smaller denomination. Examples are a cent on a struck dime, and a nickel on a struck cent. The most dramatic are those with considerable design visible from the original strike. There are a few known double denominations with different dates.


On Nickel Planchet
1) 2007 Washington - Weinberg, Byers, Saul Teichman - PCGS MS66







2) 2008 John Quincy Adams - sold on eBay for $16,100, Nick Brown, StacksBowers 3/13 (10K reserve, not sold), StacksBowers 8/13 ANA at $8,813 - PCGS MS67 16926587







On Dime Planchet
1) 2007 Monroe - sold on eBay July 2011 at $11,200, Weinberg - PCGS MS65







On Struck Nickel
1) 2007 Washington - GreatCollection.com 9/12 online auction at $14,410, Byers-Heritage 1/16 FUN at $17,625 - PCGS MS64 26001199