The coin in question is a stunning example of the Liberty Head Eagles series, specifically a $10 denomination gold coin minted in Philadelphia in 1866. This particular piece is notable for being a Proof coin, a production type that is typically struck with higher care and precision than regular issue coins, resulting in a superior finish and details that are often sought after by collectors. Weighing in at 16.72 grams, this coin is composed of gold, reflecting both the intrinsic value of its material and the historical significance of the Liberty Head design, which features a classic representation of Lady Liberty on the obverse. The reverse showcases an eagle, symbolizing strength and freedom, which is a prominent theme in American coinage. With a diameter of 27 mm and a rarity stemming from its limited mintage of only 30 pieces, this coin is highly collectible. It serves as a noteworthy piece of American numismatic history, representing the era of the mid-19th century when the gold standard was firmly established in the United States. Its Proof status further elevates its desirability among collectors and investors alike, making it a significant item for anyone interested in American currency and coinage.