The United States Post Office issued the Statue of Liberty Forever stamp in December 2010. The stamp shows the replica of the Statue of Liberty in Las Vegas rather than the original Statue of Liberty in New York. The error was not noticed until March 2011. The error was identified by Sunipix, a stock photo agency in Texas. Ten and a half billion of the error stamps

Postage stamp design error

A postage stamp design error is a mistake made during the design phase of the postage stamp production process. Design errors most commonly occur as minor mistakes, such as a missing letter in the binomial name of an organism depicted on the stamp, but some have been major gaffes, such as a map...

were produced. The mistake is the largest run of an error on a postage stamp.