Collectible coins encompass a wide variety of numismatic items, including patterns and trial coins. Patterns are prototype coins struck to test designs and compositions, often produced in limited quantities. The 1804 dollar, sometimes referred to as the "King of American Coins," is renowned for its rarity and significance, with only a few known specimens. Many of these coins were minted in Philadelphia, which was the early capital of the United States and a major center for coin production. Collecting ten-dollar coins, such as the 1913 Liberty Head or the 1907 Indian Head, represents a popular segment within the numismatic community.