Collectible coins, particularly in the context of the United States, often include various types such as trial coins and patterns. Trial coins are experimental pieces made to test designs and manufacturing processes before the final production of official currency. The 1979 Philadelphia trial coins relate to a specific year and mint, showcasing unique designs or features that differentiate them from regular circulation coins. These items are highly sought after by collectors due to their rarity and significance in numismatic history.

Item Denomination Series Year Mint
1979-P (Philadelphia) Patterns & Trial Coins Other / Varied Patterns & Trial Coins 1979 Philadelphia