Collectible coins are specialized coins sought after by numismatists for their historical significance, rarity, and condition. In the United States, collectible coins include a variety of types, such as commemorative coins, proofs, and circulation coins that have attained numismatic value. Pitt Tokens, specifically minted in 1766, were used as a form of currency in colonial America and are now considered historical artifacts. Their limited production and unique design contribute to their desirability among collectors.