Collectible coins, particularly in the context of the United States, encompass a wide range of coin types, including patterns, which are trial strikes or designs created to test a new coinage concept before full production. The 1849 P 20, or the Twenty Dollar Gold Piece, is a notable example, representing early American gold coinage. Patterns from this era are particularly sought after by collectors due to their limited mintages and historical significance, often showcasing unique designs that differ from standard circulation coins.

Item Denomination Series Year Mint
1849 P$20 Brass Gilt J-118 P$20 Patterns 1849 Philadelphia