Collectible coins, particularly those from the United States, encompass various types, including rare patterns and historical issues. The PH10c refers to a specific type of pattern coin designed in 1854, struck in Philadelphia. These coins often feature unique designs that were proposed but never mass-produced, making them highly sought after by collectors. The 1854 Philadelphia patterns are notable for their distinctive artistic elements and limited mintage, contributing to their value and desirability in the numismatic community.