The product is a 1976-S Bi-Centennial Washington Quarter 25Cent Clad PROOF coin from the US Mint's proof set. This uncirculated coin has a composition of 75% copper and 25% nickel over a pure copper center, struck as a proof coin in San Francisco. Certified by the U.S. Mint, this coin features President George Washington on the obverse and is a collectible piece representing the United States bicentennial celebration in 1976.