The 1794 Flowing Hair Silver Dollar

For the time being, the 1794 Flowing Hair Silver Dollar may hold the title of most expensive coins ever sold. Some analysts think 1794 Flowing Hair Silver Dollar was the United States Mint's first silver dollar. A profile of Lady Liberty with flowing hair appears on the front, while an American eagle appears on the reverse. The currency was struck in 1794 and 1795 and was modeled after the Spanish dollar, which was widely used in trade across the Americas. Fewer than 1,800 of these coins were ever made, and one expert estimates that just 120 to 130 exist, making them very uncommon.

Colonel E.H.R. Green had previously possessed the coin, which was auctioned off by Stack's Bowers Galleries in January 2013. Former owner Steven Contursi described the coin as a "national treasure".

Price: over $10 million