<P> In 2000, the Mint was responsible for the production of 28 billion coins . See United States Mint coin production for annual production values of each coin . </P> <P> The United States Mint Police, a federal law enforcement agency, is responsible for the protection of Mint facilities, employees and reserves . </P> <P> With the exception of a brief period in 1838 and 1839, all coins minted at U.S. branch mints prior to 1909 displayed that branch's mintmark on their reverse . Larger denominations of gold and silver coins were labeled with the Dahlonega, Charlotte, and New Orleans mintmarks (D, C, and O, respectively) on the obverse (just above the dates) in those two years . Carson City, which served as a U.S. branch mint from 1870 to 1893, produced coins with a CC mintmark . The Manila Mint (the only overseas U.S. mint, which produced U.S. Territorial and U.S. Commonwealth coinage) used the M mintmark from 1920--1941 . </P> <P> Between 1965 and 1967, as the Mint labored to replace the silver coinage with base metal coins, mintmarks were temporarily dispensed with (including on the penny and nickel) in order to discourage the hoarding of coins by numismatists . Mintmarks were moved to the obverse of the nickel, dime, quarter, and half dollar in 1968, and have appeared on the obverse of the dollar coin since its re-introduction in 1971 . </P>

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