1879 Gold Stella
Back in the late 1800s, there was an effort in Europe to form a single currency. The Latin Monetary Union was the leading organization of this movement, and the United States tried to conform for a short time. The Stella was created to match the composition and weight of other coins in that union, which was eventually dissolved in 1927. John Kasson, Congressman of Iowa, proposed a gold coin worth $4. The weight would match the Austro-Hungarian 8 florin piece, but the coin was never approved for full-scale production. Despite that, some coins still made their way into circulation. Most coin collectors would happily pay a small fortune to get their hands on one of these rare coins. A recent two-coin set from the Smithsonian sold for almost $5,000 in 2021.