Collectible coins, particularly those from the United States, encompass a variety of types, including patterns, which are experimental designs created to test new ideas for coinage. The 1879 patterns are especially notable as they featured innovative designs and differed from standard mint issues. Patterns serve as important historical artifacts and are highly sought after by collectors due to their limited mintage and unique characteristics. The value of these coins can vary significantly based on factors such as rarity, condition, and demand among collectors. The letter "P" in this context may refer to the Philadelphia Mint, where many of these coins were produced.