The 1989 US Congress Bicentennial Silver Dollar & Half Dollar Set includes coins made of modern silver and clad materials, each struck in proof condition at the San Francisco Mint. The set comes with a box and Certificate of Authenticity from the U.S. Mint, showcasing its commemorative nature in honor of the 200th anniversary of the US Congress. This set is a valuable addition to any coin collection, representing a significant historical milestone in American numismatics.