A quarter is engraved at the U.S. Mint on Wednesday, June 27, 

A quarter is engraved at the U.S. Mint on Wednesday, June 27, 2012, in Philadelphia. The new $3.9 million exhibit opens a new tour to visitors on July 3 and it's the first upgrade in more than 40 years.(AP Photo/Brynn Anderson)
Associated Press
A quarter is engraved at the U.S. Mint on Wednesday, June 27, 2012, in Philadelphia. The new $3.9 million exhibit opens a new tour to visitors on July 3 and it's the first upgrade in more than 40 years.(AP Photo/Brynn Anderson)
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