One Hundred Dollar Silver Certificates were backed by an equivalent amount of silver bullion held in the U.S. Treasury. They were considered a form of currency and were widely used in the United States during the early 20th century. However, they were eventually discontinued, and the last series of Silver Certificates was issued in 1957.
Today, One Hundred Dollar Silver Certificates are considered collectible items and their value can vary depending on their condition and rarity.