As a numismatist with a deep interest in the history and rarity of coins, I can provide you with some examples of the most rare coins that have captured the attention of collectors and historians alike. Rarity can be determined by factors such as the number of coins minted, historical significance, and the condition of the coin.

1. The 1933 Double Eagle: This $20 gold piece is one of the most famous and valuable coins in the world. Only a handful are known to exist, and their legal status has been a subject of controversy.

2. The 1804 Silver Dollar: Often referred to as the "King of American Coins," this dollar is extremely rare. Most of the 1804 dollars were actually minted in the 1830s for use in diplomatic gifts.

3. The 1913 Liberty Head Nickel: This is one of the most famous coins in the United States, with only five known to exist. It is often called the "Million Dollar Nickel" due to its high value.

**4. The Flowing Hair Silver Dollar (1794-1795):** As the first silver dollar minted by the United States, these coins are highly sought after by collectors.

5. The Brasher Doubloon: This gold coin, minted by Ephraim Brasher in 1787, is another rarity with a fascinating backstory.

6. The 1894-S Barber Dime: Only 24 of these dimes were minted, making them incredibly rare.

7. The 1895 Proof Morgan Silver Dollar: This coin is known for its rarity and is often sought after by collectors.

8. The 1870-S Seated Liberty Dollar: This coin is considered one of the great rarities in American numismatics.

9. The 1822 Half Eagle: This $5 gold coin is another rarity, with a limited mintage.

10. The 1916 Standing Liberty Quarter: This coin is known for its distinctive design and limited mintage.

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List of most expensive coinsPriceYearType$10,016,8751794Flowing Hair Dollar$7,590,02019331933 Saint-Gaudens Double Eagle$7,400,0001787Brasher Doubloon - EB on Breast$6,029,4001723Umayyad Gold Dinar23 more rowsread more >>