This coin is a 1964 Proof Washington Quarter, produced by the Philadelphia Mint. It is part of the Washington Quarters series, which has been a staple in U.S. numismatics since its introduction in 1932. With a denomination of 25 cents, this quarter is made of 90% silver, giving it both intrinsic value and appeal to collectors. The coin features a diameter of 24.3 mm and weighs 6.25 grams, characteristics that are standard for quarters. It was minted in a Proof finish, indicating that it was produced for collectors rather than general circulation, resulting in a coin with a high-quality, mirror-like surface and sharp details. The total mintage for this particular year and type is 3,950,762 pieces, which contributes to its availability in the market. As a Proof coin from an iconic series, the 1964 Washington Quarter is highly sought after by collectors, especially due to its silver content and historical significance. In summary, this 1964 Proof Washington Quarter, minted in Philadelphia, is a beautiful representation of American numismatic heritage, valued by collectors for both its artistry and its silver composition.