The coin in question is a historical piece from the United States, specifically part of the "Colorado Gold" series, minted in Philadelphia in the year 1861. It is a proof coin, which indicates that it was produced with a special process to create a high-quality finish, often made for collectors rather than for regular circulation. This particular coin is a ten-dollar denomination, commonly referred to as a "$10 (Ten Dollars)". Although the specifics of its diameter, width, weight, and edge type are not provided, the material composition is noted as copper. It's important to highlight that this coin has a recorded mintage of zero, suggesting it may be exceptionally rare or possibly that it was never actually produced for circulation. With no mint mark, this coin is categorized under the type "Coins" and serves as a significant item for collectors interested in historic U.S. currency. The year 1861 is notable in American history, coinciding with the onset of the Civil War, which adds a layer of historical significance to the coin. Overall, this piece represents a unique intersection of numismatics, history, and artistry, making it a valuable collectible for enthusiasts focusing on 19th-century American coins.