Collectible coins include a variety of types, such as everyday circulation coins, rare variants, and commemorative issues. The United States Mint produces notable collectible coins, including the 1 One Cent Penny, which has undergone various design changes since its inception. Patterns and trial coins, such as those minted in Philadelphia in 1818, are significant to numismatics due to their experimental nature and limited mintage. These coins are highly sought after by collectors due to their historical context and rarity.

Item Denomination Series Year Mint
United States of America 1818 Philadelphia Patterns & Trial Coins 1¢ 1¢ (One Cent, Penny) Patterns & Trial Coins 1818 Philadelphia