The coin in question is a Seated Liberty Dollar from the year 1866, minted at the Philadelphia Mint, denoted by the "P" mint mark. This particular coin belongs to the United States of America currency system and has a denomination of $1 (One Dollar). The Seated Liberty Dollars were minted during a time when silver coins were prevalent and featured the iconic design of Lady Liberty seated, a representation of freedom and independence. With a weight of 26.73 grams and a diameter of 38.1 millimeters, this coin is composed entirely of silver, making it a valuable piece for both collectors and investors. The total mintage for the 1866 Seated Liberty Dollar was 48,900 coins, indicating that it may be a relatively scarce find in the market. Given its age, historical significance, and silver content, the condition and grade of the coin will greatly influence its value. The Seated Liberty series is well-regarded among numismatists, particularly for its intricate design and the historical context of its creation during a transformative period in American history. Overall, this 1866 Seated Liberty Dollar represents a fascinating piece of American numismatic heritage.