Special Mint Sets (SMS) were produced by the United States Mint in response to the demand for high-quality coins during the years of production from 1965 to 1967. The 1966 Special Mint Set includes coins such as the 1-cent (1c) coin and the 50-cent (50c) coin, which were struck with a unique process to enhance their finish compared to regular circulation coins. These sets are highly sought after by collectors due to their limited mintage and distinctive appearance, which features a brilliant and polished luster. The SMS coins from 1966 are characterized by their lack of a mint mark, as they were produced at the Philadelphia Mint.

Item Denomination Series Year Mint
1966 1c- 50c Special Mint Set 1c- 50c Special Mint Sets 1966 San Francisco