Collectible coins include various types such as patterns, which are test coins produced to assess designs before mass production. The P25c, or 25-cent coin, refers to the quarter dollar denomination in the United States. In 1882, specific patterns were created as part of the design process for U.S. coins, often featuring innovative motifs and compositions. These coins, especially in pristine condition, are highly sought after by collectors and can command significant premiums in the market.