Collectible coins are typically categorized into several types, including numismatic coins, bullion coins, and commemorative coins. Numismatic coins are valued for their rarity, historical significance, and demand among collectors, while bullion coins are primarily valued based on their metal content, such as gold or silver. The United States Mint produces a variety of collectible coins, including state quarters, presidential dollar coins, and silver eagles. The "P" mint mark indicates that a coin was produced at the Philadelphia Mint, while the "50" could refer to the denomination of a coin, such as the 50-cent piece. Collectors often seek to find coins with low mintage or unique features to enhance their collections.