Philadelphia was the only mint in operation in those earliest years, and identification of the coinage was not necessary.  The practice was continued even after the branch mints were established.  In 1942, however, when World War II restrictions upon the use of metal made a change in the 5-cent...

The "S" Mint mark was used on San Francisco coins until 1955, when production there was suspended.  Operations were resumed in 1965, but on a limited basis.  A supplemental coinage of cents for circulation was produced from 1968 through 1974; nickels were struck in 1968, 1969 and 1970.  All bore the...

The Denver Mint is a branch of the United States Mint that struck its first coins on February 1, 1906. The mint is still operating and producing coins for circulation, as well as mint sets and commemorative coins. Coins produced at the Denver Mint bear a D mint mark (not to be confused with the mark...