For sale is a lot of five Silver Washington Quarters, minted between 1960 and 1964. Each coin has been certified by NGC with a Proof grade of PR 68. The coins are uncirculated and composed of 0.9 fineness silver. The strike type is proof and the certification number may vary. The denomination is 25 cents and the mint location is Philadelphia. These coins are a great addition to any collection and a fantastic opportunity to own a piece of United States coinage history.