The set, contains proof versions of the commemorative quarters honoring
2009 District of Columbia quarter 2009 Commonwealth of Puerto Rico
quarter 2009 Guam quarter 2009 American Samoa quarter 2009 U.S. Virgin
Islands quarter 2009 Northern Mariana Islands . Proof coins are produced at the United
States Mint at San Francisco, using specially prepared, highly polished
dies. Specially treated coin blanks are struck multiple times to ensure
the finest detail in a frosted cameo image on a brilliant, mirror–like
background.