On August 12, 1974, the three designers were at the Philadelphia Mint,... - dofaq.co
united states bicentennial coinage

On August 12, 1974, the three designers were at the Philadelphia Mint,...

 wikipedia - 04 Jul 2015
On August 12, 1974, the three designers were at the Philadelphia Mint, where they ceremonially operated the presses to strike the first coins bearing their designs. These prototypes were exhibited under armed guard at the American Numismatic Association convention in Florida the next day. They differ from all other Bicentennial coins in that they were struck in silver proof without mint mark; other silver proof coins bear an "S" mint mark as struck at the San Francisco Assay Office (as the San Francisco Min

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