You are looking at a remarkable example of American numismatics: the 1864 Seated Liberty Dollar, minted in Philadelphia (Mint Mark: P). This particular coin is not just any dollar; it is a Proof coin, which indicates that it was produced with exceptional attention to detail and a higher quality finish than standard circulation coins. The Seated Liberty design, which features a representation of Liberty sitting elegantly, is a classic symbol of freedom and strength. Made from silver, this coin has a substantial weight of approximately 26.73 grams and a diameter of 38.10 millimeters. With a very limited mintage of only 470 pieces, this coin is extremely rare and holds a high significance among collectors and enthusiasts alike. Its collectible value stems not only from its age but also from its unique production type and the beauty of its design. In terms of condition and grading, the state of preservation can substantially influence its market value. Coins like this one, especially in high grades, can demand significant prices at auctions and among collectors. As an artifact from 1864, this Seated Liberty Dollar serves as a tangible link to American history, making it an invaluable piece for any serious collector or historian.