1967-P 25C SMS (Special Strike) NCG MS67 (AO)

The 1967 Washington Quarter, including the Special Mint Set (SMS) strike, has a  consisting of outer layers of a copper-nickel alloy bonded to a pure copper inner core. It contains no silver. 

In 1965, 1966, and 1967, the U.S. Mint did not make regular proof sets or uncirculated mint sets. This was during a coin shortage, and the Mint wanted to discourage coin hoarding. Instead, they issued Special Mint Sets (SMS) each of those three years.  Special Mint Set (SMS) is a set of coins made with a better finish than normal circulation coins, but not as highly polished as proof coins. The specific composition is:

Outer layers: 75% copper and 25% nickel (cupro-nickel)

Inner core: Pure copper

Overall composition (by weight): Approximately 91.67% copper and 8.33% nickel

Weight: 5.67 grams (AO)