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Up till 1964 almost all proof coins were minted in Philadelphia. After the coin shortages of the mid-1960s the Mint decided that it was better to keep proof coin production separate from regular minting so that Philadelphia could use all of its facilities to strike circulation coins. The San Francisco Mint had been reactivated but was only minting small numbers of cents and nickels, so they were the obvious location to handle proofs. However, in 1999 Philadelphia struck proof $1 coins.

Also, some branch mints struck proof coins in the 19th century.

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