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San Francisco

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 letter “S,” as did a coinage of dimes in 1975.  Cents were manufactured at San Francisco for general circulation, as well as the West Point Bullion Depository, under auxiliary authority of the Congress in the early 1980′s.  However, in order to assure maximum circulation of this small production, no mint marks were used.  Special Mint Sets were produced for collectors at San Francisco during 1965, 1966 and 1967.  Due to the restrictions on coin identification in force at that time, no mint marks were used.  Proof coin operations were moved from the Philadelphia Mint to San Francisco in 1968, and the letter “S” identifies that special numismatic coinage.  In addition, all proof coinage produced by West Point carries a “W” mint mark.

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