20 Dollars John Adams

Liberia's late-1990s and early-2000s commemorative program was one of the most prolific — and commercially cynical — in the history of modern numismatics. Dozens of foreign minting houses, primarily in Germany and China, produced hundreds of silver issues nominally denominated in Liberian dollars for a country whose own citizens had largely abandoned the currency. These pieces were sold almost entirely to Western collectors through mail-order dealers, never circulating in Liberia at all.

Adams remains one of the few U.S. presidents never to appear on a circulating American coin or banknote.