20 Cents "1864" (Pattern; silver) , United States

Obverse: Captains Lewis and Clark planning another day of exploration. Lewis holds a rifle and journal and Clark points into the distance. A river bank is seen in the background., Reverse: The Peace Medal that Lewis and Clark presented to Native Americans during the course of their journey. Original Peace Medal pictured below. Two feathers are on either side with 17 stars above, representing the number of states when the expedition took place.

Obverse: Composite profile of Iron Tail, an Oglala Sioux chief, Two Moons, a Cheyenne chief, and Big Tree, a Kiowa chief., Reverse: According to the legend, the buffalo used as a model for this coin was "Black Diamond" (1893-1915), a famous buffalo at the Central Park zoo in New York City NOTE: If there is a mintmark, it is below "E C" of "FIVE CENTS"

Obverse: The portrait in left profile of George Washington, the first President of the United States from 1789 to 1797., Reverse: The reverse design depicts a red mangrove tree in an early stage of its life cycle, as it evolves from a very small plant to an adult tree. The design brings awareness to the park’s endangered mangrove forests and the unique and delicate nature of how the species reproduces in salt water.