Collectible coins can include various types of currency produced for circulation or commemorative purposes, often sought after by numismatists. In the United States, specific collectible coins like the 2023 dollar coins minted in Philadelphia may be part of a series or special release, appealing to collectors for their rarity, design, or historical significance. A roll typically consists of a set quantity of coins, often 25 in the case of dollar coins, and can be sold or traded among collectors. The mint mark, such as "P" for Philadelphia, indicates the production facility and can influence a coin’s value.