Collectible coins encompass a wide variety of types, including those issued by governments, private entities, and commemorative designs. In the context of the United States, the 25-cent quarter is a well-known denomination, with various designs and series released since its inception. Privately issued patterns, such as those from 1915, are typically non-circulating pieces created by private mints or individuals and are sought after by collectors for their historical significance and rarity. These patterns often showcase innovative designs that were never adopted for general circulation.

Item Denomination Series Year Mint
United States of America 1915 Philadelphia Privately-issued "Patterns" 25¢ 25¢ (Twenty Five Cents, Quarter) Privately-issued "Patterns" 1915 Philadelphia