Lot of six Sterling Silver coin proofs by Franklin Mint - "The History of the United States." Each coin weighs approx. 1 ounce. Includes "First Powered Heavier Than Air Flight, Lindenberg Makes Solo Flight, Panama Canal Opened to Commerce, Lusitania Sunk by Submarine, US Navy on World Cruise, and The Race to the North Pole. All coins are in original packaging, Lindenberg and First in Flight package is cut in half but still in tact. All coins are in good condition.