In the realm of collectible coins, the term "patterns" refers to experimental coins struck by mints to test new designs or minting processes before official production. The 1875 Philadelphia patterns are notable examples, as they were produced in limited quantities and often feature unique designs that differ from circulating coinage of the time. These coins are highly sought after by collectors due to their historical significance and rarity, especially those associated with the United States of America, reflecting the coinage innovations of the era. The "P" mint mark signifies coins produced in Philadelphia, further contributing to their collectible value.

Item Denomination Series Year Mint
1875 P$2.50 Copper J-1434 RD P$2.50 Patterns 1875 Philadelphia