The 1979 United States Proof Set includes coins with a denomination of $1, composed of copper, struck as proof in San Francisco. This set is a valuable collector's item representing the minting of coins in the United States during the year 1979. Each coin is carefully crafted and meticulously struck to ensure a high level of quality and proof of its authenticity. The set is a piece of American numismatic history that holds significance for collectors and enthusiasts of US coins.