Wartime Jefferson Nickel : The Jefferson Nickel, introduced in 1938, underwent a dramatic change during World War II. To save nickel for military use in armor and weapons, the U.S. Mint altered the coin’s composition between 1942 and 1945. These special issues, now called Wartime Jefferson Nickels, were made from an alloy of silver, copper, … Continue reading Wartime Jefferson Nickel Worth a Fortune – How It Became One of the Most Valuable U.S. Coins