Collectible coins refer to coins that are sought after by collectors due to their historical significance, rarity, or unique characteristics. In the United States, notable examples include the Massachusetts silver coins minted in 1652, which are among the earliest coins issued in the American colonies. The Philadelphia Mint, established in 1792, is another significant location for producing U.S. coinage, creating a variety of coins that are now valued by collectors. Coins from these early periods often carry substantial historical interest and can be highly sought after in the numismatic community.