There are just a handful of Capped Bust Large Diameter half eagles produced from 1813 through 1829 that are not very rare. This type includes some of the rarest United States gold issues ever produced so the type collector is left with essentially four dates that are sometimes available: 1813, 1814/3, 1818 and 1820. In my opinion, the 1818 is one of the most interesting of these four issues and it is certainly one of the most misunderstood.
Full Article: The Half Eagles of 1818 - CoinLink
