The 2018 S Proof Sacagawea Dollar $1 Coin from the Proof Set is a valuable uncirculated coin featuring Native American imagery. Minted in San Francisco with a copper composition, this coin celebrates the Lewis and Clark Expedition with its depiction of Sacagawea. Ungraded and uncertified, this United States coin is a prized collectible for numismatists interested in American history and coinage.