This is a 2001 Sacagawea Dollar, specifically a Proof coin produced by the San Francisco Mint. The coin is a part of the United States dollar series and is made primarily of manganese-brass, giving it a distinctive golden color and durability. With a diameter of 26.5 mm and a weight of 8.07 grams, it represents a denomination of one dollar. The Proof version of this coin is known for its highly polished finish, providing an exceptional luster and detail that make it popular among collectors. The total mintage for this particular coin stands at 3,183,740, contributing to its availability in the market. Display-wise, the proof quality enhances the intricate details of Sacagawea's portrait on the obverse and the eagle on the reverse, making it an ideal showcase piece. As it is a San Francisco Mint issue, the coin features the 'S' mint mark. This combination of rarity, artistry, and historical significance makes the 2001 Sacagawea Proof Dollar a notable item for numismatists and enthusiasts of American currency alike.