The coin in question is a 1878 Gold Dollar, specifically from the series of Gold Dollars that were minted in the United States. This particular coin was produced at the Philadelphia Mint and carries the mint mark 'P'. It has a denomination of $1, or one dollar, making it a valuable piece of American numismatic history. Crafted from gold, this coin weighs approximately 1.67 grams and has a diameter of 15 millimeters. The mintage for this specific year and type was limited, with only 3,000 pieces produced, which adds to its rarity and potential value among collectors. Due to its small size and gold material, the 1878 Gold Dollar is not just a representation of its face value, but also a tangible piece of history, reflecting the economic conditions and minting practices of the late 19th century in the United States. The coin's details, along with its historical significance and scarcity, make it an object of interest for both coin collectors and historians alike.