2004 Westward Journey Nickel Series Coin Set. The U.S. Mint began the Westward Journey Nickel Series in 2004 with the release of the “Peace Medal” and “Keelboat” nickels. In 2005, a new likeness of Thomas Jefferson appeared on the obverse in recognition of his role in the Louisiana Purchase and commissioning the Lewis and Clark expedition. The “American bison” reverse was representative of the wildlife encountered by the expedition. The second coin of 2005 depicted a scene of the Pacific Ocean, highlighting the expedition’s exultation on believing they had finally reached the Pacific Ocean after many months of travel.