Collectible coins can include various types, such as historical coins, commemorative coins, and those with unique mintages or errors. The United States One Cent Penny, commonly referred to as the penny, has undergone several design changes since its first minting in 1793. The Philippines experienced a period of U.S. sovereignty from 1898 to 1946, during which unique coinage was produced for the islands, including the 1931 coins that are sought after by collectors. The rarity and condition of such coins can significantly impact their value, often making unknown mintage figures appealing to numismatists.

Item Denomination Series Year Mint
1931-- (Unknown) Philippines Under U.S. Sovereignty 1¢ (One Cent, Penny) Philippines Under U.S. Sovereignty 1931 Unknown