Collectible coins, particularly those from the United States, encompass a wide range of types and series. Among the notable varieties is the 1908 pattern coin, which refers to trial or experimental coins struck for potential introduction into circulation. The "P 20" designation often refers to a specific pattern or design related to the U.S. Mint's production processes. Collectors highly prize these patterns for their uniqueness and historical significance, as they reflect the evolution of American coinage. Patterns are typically produced in limited quantities and might feature design elements that differ from regular issue coins.

Item Denomination Series Year Mint
1908 P$20 Gold J-1922 P$20 Patterns 1908 Philadelphia