Collectible coins, particularly those from the United States, encompass various types such as the 10 cent dime and specialized categories like patterns and trial coins. The 10 cent dime is a denomination that has been produced in several designs and compositions since its inception. Patterns are test coins created primarily for evaluation of designs and are typically struck in limited quantities, while trial coins are produced to assess minting processes or techniques. Dimes from the year 1840 may include notable varieties, including the Seated Liberty design, which characterized many coins during that period.

Item Denomination Series Year Mint
United States of America 1840 Philadelphia Patterns & Trial Coins 10¢ 10¢ (Ten Cents, Dime) Patterns & Trial Coins 1840 Philadelphia