1966 United States Special Mint Set – Enhanced SMS Coins in Acrylic Holder

The 1966 United States Special Mint Set (SMS) represents the second year of the three-year SMS program issued during the temporary suspension of traditional Proof Sets and Uncirculated Mint Sets. Each 1966 SMS contains one coin of every circulating denomination struck that year, produced with a distinctive satin-like finish that offers sharper detail and a higher-quality appearance than regular circulation strikes. A total of 2,261,583 Special Mint Sets were officially released in 1966.

A notable upgrade this year is the transition to a more durable and visually appealing acrylic display holder, replacing the softer plastic case used in 1965. This rigid acrylic format provides excellent long-term protection and a clearer view of the coins, making it a preferred style among collectors. The set includes the Lincoln Cent, Jefferson Nickel, Roosevelt Dime, Washington Quarter, and the 1966 Kennedy Half Dollar, all struck with the SMS-specific finish produced using improved dies and specialized preparation.

The 1966 SMS is especially appreciated for its higher consistency in strike quality, improved surfaces, and the enhanced presentation provided by the acrylic case. For collectors assembling a complete run of Special Mint Sets or focusing on the mid-1960s clad-transition era, the 1966 Special Mint Set stands as an important and visually appealing addition.

Continue exploring our full range of U.S. Mint Sets or browse exclusively within our Special Mint Sets section to complete your collection. You may also enjoy our related category of Lincoln Cents for more classic mid-century designs.