In the context of collectible coins, patterns refer to trial strikes or experimental pieces created to test new designs or compositions before official production. The 1873 "P" (Philadelphia Mint) patterns are particularly notable in the history of U.S. coinage as they represent proposed designs for denominations such as the trade dollar and the seated liberty series. These patterns are rare and highly sought after by collectors due to their historical significance and limited mintage, often providing insights into the evolving design philosophy of the United States Mint during that era.

Item Denomination Series Year Mint
1873 P$20 Copper J-1344 BN P$20 Patterns 1873 Philadelphia