The Three Dollar Gold coin, also known as the "Three Dollar Piece," was minted in the United States from 1854 to 1889. It has a unique denomination that was intended to facilitate gold transactions and was primarily used for trade and investment purposes. The 1878 Three Dollar Gold coin is particularly notable for its limited mintage and is highly sought after by collectors. These coins are composed of 90% gold and 10% copper, contributing to their intrinsic value, and they feature distinctive designs, including Lady Liberty on the obverse and an eagle on the reverse. Collectors often focus on factors such as rarity, condition, and historical significance when assessing the value of these coins.