Collectible coins, specifically in the context of the United States, include various types such as patterns and trial coins. Patterns are experimental pieces created to test new designs and compositions, often not intended for circulation. One significant example is the 1836 fifty-cent pattern coin minted in Philadelphia, which features distinct design elements that differentiate it from standard issues. These coins serve as valuable collectibles for numismatists due to their rarity and historical significance.

Item Denomination Series Year Mint
United States of America 1836 Philadelphia Patterns & Trial Coins 50¢ 50¢ (Fifty Cents) Patterns & Trial Coins 1836 Philadelphia
United States of America 1836 Philadelphia Patterns & Trial Coins 50¢ 50¢ (Fifty Cents) Patterns & Trial Coins 1836 Philadelphia