Collectible coins refer to various types of coins sought after by collectors due to their rarity, historical significance, or unique features. Among these are the fifty-cent coins from the United States of America, often called half dollars, which have been produced in different series and designs. Patterns and trial coins, such as those minted in 1915 in Philadelphia, represent experimental pieces created to test new designs or minting techniques, making them particularly valuable to collectors due to their limited issuance.

Item Denomination Series Year Mint
1915-P (Philadelphia) Patterns & Trial Coins 50¢ (Fifty Cents) Patterns & Trial Coins 1915 Philadelphia