New Mint
The new Mint was opened in 1937. Beginning in 1955, circulating coinage from San Francisco was suspended for 13 years. In 1968, it took over most proof coinage production from the Philadelphia Mint, but continued striking a supplemental circulating coinage from 1968 through 1974. Since 1975, the San Francisco Mint has been used only for proof coinage, with the exception of the Susan B. Anthony dollar from 1979–81 and a portion of the mintage of cents in the early 1980s. The dollars bear a mintmark of an "S", but the cents are otherwise indistinguishable from those minted at Philadelphia (which bear no mintmarks, unlike those years' proof cents from San Francisco and circulation cents from Denver). From 1962 to 1988, the San Francisco Mint was officially an assay office; the San Francisco Assay Office was granted mint status again on March 31, 1988 (Pub.L. 100–274). The San Francisco Mint is located at 155 Hermann Street, but does not admit visitors.
Read more about this topic: San Francisco Mint