Collectible coins are often categorized based on various criteria such as type, historical significance, condition, and rarity. In the United States, the five-cent nickel and half dime are notable examples from the mid-19th century. The Seated Liberty Half Dime, minted from 1837 to 1891, features a seated figure representing liberty on the obverse and has been popular among collectors due to its design and historical context. The specific coin from 1840 is part of the early Seated Liberty series, which includes various mint marks and variations that can affect its collectible value.

Item Denomination Series Year Mint
1840-O (New Orleans) Seated Liberty Half Dimes 5¢ (Five Cents, Nickel, Half Dime) Seated Liberty Half Dimes 1840 New Orleans
1840-P (Philadelphia) Seated Liberty Half Dimes 5¢ (Five Cents, Nickel, Half Dime) Seated Liberty Half Dimes 1840 Philadelphia
1840-P (Philadelphia) Seated Liberty Half Dimes 5¢ (Five Cents, Nickel, Half Dime) Seated Liberty Half Dimes 1840 Philadelphia