Collectible coins refer to pieces of currency that are sought after by numismatists and collectors for their historical significance, rarity, or aesthetic appeal. In the United States, notable collectible coins include the One Dollar coin, which has seen various designs and series over time. The Coronet Head Cent, minted from 1816 to 1857, features a distinct design that represents a classic era in American coinage, with specific editions like the 1836 Coronet Head Cent being particularly prized among collectors.