The 1966 Special Mint Set is a valuable collection of coins issued by the United States Mint in 1966. This set includes a 40% silver half dollar, struck in proof quality at the Philadelphia Mint. Each coin is uncirculated and carries the certification of the U.S. Mint, making it a sought-after piece for collectors of US coins. This set is a cherished addition to any numismatic collection, showcasing the craftsmanship and historical significance of coins from the 1960s.