The coin in question is a 1869 Seated Liberty Quarter, a notable piece of American numismatic history. This specific quarter was minted at the Philadelphia Mint, which is denoted by the "P" mint mark. It has a denomination of 25 cents, commonly referred to as a quarter, and is composed of silver, adding to its intrinsic value. Produced as a proof coin, this 1869 Seated Liberty Quarter showcases the exceptional craftsmanship characteristic of proof coins of the era, with a beautiful, mirrored finish that highlights the intricate designs. The coin measures 24.3 millimeters in diameter and weighs 6.22 grams, making it a standard size and weight for quarters of that period. With a limited mintage of just 600 units, this particular coin is quite rare and holds significant value for collectors. Its status as a part of the Seated Liberty series, which features a depiction of Lady Liberty seated on a rock, adds to its historical allure. This coin not only represents monetary value but also embodies the artistry and historical significance of American coinage during the 19th century.